Add provider-resolved Java local sources

.gitignore

@@ -18,3 +18,6 @@ xcuserdata/
 
 # Swift Package Manager local state
 .swiftpm/
+
+# Example data
+exampledata/

World Manager for Minecraft/Models/Sources/SourceRecord.swift

@@ -42,6 +42,28 @@ nonisolated struct SourceAccessStatus: Hashable, Sendable, Codable {
     var warningText: String?
 }
 
+nonisolated enum SourceProbeConfidence: Int, Comparable, Hashable, Sendable, Codable {
+    case none = 0
+    case weak = 25
+    case medium = 50
+    case strong = 75
+    case exact = 100
+
+    static func < (lhs: SourceProbeConfidence, rhs: SourceProbeConfidence) -> Bool {
+        lhs.rawValue < rhs.rawValue
+    }
+}
+
+nonisolated struct SourceProbeResult: Hashable, Sendable {
+    let providerID: PlatformProviderID
+    let edition: MinecraftEdition
+    let confidence: SourceProbeConfidence
+    let sourceRootURL: URL
+    let displayName: String
+    let detectedKinds: Set<MinecraftContentKind>
+    let warnings: [String]
+}
+
 nonisolated enum WorkStageState: String, Hashable, Sendable, Codable {
     case pending
     case running

World Manager for Minecraft/Services/AppSupport/Export/ContentPackageExporter.swift

@@ -37,7 +37,11 @@ enum ContentPackageExporter {
             try fileManager.removeItem(at: archiveURL)
         }
 
-        try await createArchive(for: item, source: source, at: archiveURL)
+        if isPortableFileItem(item) {
+            try copyPortableFileItem(item, to: archiveURL, fileManager: fileManager)
+        } else {
+            try await createArchive(for: item, source: source, at: archiveURL)
+        }
         return archiveURL
     }
 
@@ -284,6 +288,28 @@ enum ContentPackageExporter {
         item.capabilities.portablePackageExtension ?? item.contentType.archiveExtension
     }
 
+    nonisolated private static func isPortableFileItem(_ item: MinecraftContentItem) -> Bool {
+        guard item.sourceEdition == .java else {
+            return false
+        }
+
+        guard let expectedExtension = item.capabilities.portablePackageExtension else {
+            return false
+        }
+
+        let values = try? item.folderURL.resourceValues(forKeys: [.isRegularFileKey])
+        return values?.isRegularFile == true
+            && item.folderURL.pathExtension.localizedCaseInsensitiveCompare(expectedExtension) == .orderedSame
+    }
+
+    nonisolated private static func copyPortableFileItem(
+        _ item: MinecraftContentItem,
+        to destinationURL: URL,
+        fileManager: FileManager
+    ) throws {
+        try fileManager.copyItem(at: item.folderURL, to: destinationURL)
+    }
+
     nonisolated private static func uniqueArchiveURL(
         in directoryURL: URL,
         baseName: String,

World Manager for Minecraft/Services/AppSupport/Scanning/ContentItemFileFacts.swift

@@ -25,14 +25,32 @@ struct ContentItemFileFacts: Sendable {
             self.approximateAgeText = nil
         }
 
-        switch item.contentType {
-        case .world:
-            let levelDBURL = item.folderURL.appendingPathComponent("db", isDirectory: true)
-            self.storageFormatLabel = fileManager.fileExists(atPath: levelDBURL.path)
-                ? "LevelDB world storage"
-                : "Flat-file world storage"
-        case .behaviorPack, .resourcePack, .skinPack, .worldTemplate:
-            self.storageFormatLabel = "Manifest-based package"
+        switch item.sourceEdition {
+        case .bedrock:
+            switch item.contentType {
+            case .world:
+                let levelDBURL = item.folderURL.appendingPathComponent("db", isDirectory: true)
+                self.storageFormatLabel = fileManager.fileExists(atPath: levelDBURL.path)
+                    ? "LevelDB world storage"
+                    : "Flat-file world storage"
+            case .behaviorPack, .resourcePack, .skinPack, .worldTemplate:
+                self.storageFormatLabel = "Manifest-based package"
+            }
+        case .java:
+            switch item.contentKind {
+            case .world:
+                self.storageFormatLabel = "Anvil world storage"
+            case .mod:
+                self.storageFormatLabel = "Java mod archive"
+            case .shaderPack:
+                self.storageFormatLabel = "Shader pack archive"
+            case .resourcePack:
+                self.storageFormatLabel = "Resource pack archive"
+            case .dataPack:
+                self.storageFormatLabel = "Data pack archive"
+            case .behaviorPack, .skinPack, .worldTemplate:
+                self.storageFormatLabel = "Java content"
+            }
         }
     }
 }

World Manager for Minecraft/Services/AppSupport/Scanning/WorldScanner.swift

@@ -22,6 +22,49 @@ enum BedrockContentScanner {
         await packReferenceIndexStore.reset(for: sourceRootURL)
     }
 
+    nonisolated static func probeLocalFolder(_ url: URL, providerID: PlatformProviderID) -> SourceProbeResult? {
+        let fileManager = FileManager.default
+        let normalizedURL = url.standardizedFileURL
+        var detectedKinds = Set<MinecraftContentKind>()
+        var score = 0
+
+        let collectionKinds: [(String, MinecraftContentKind)] = [
+            ("minecraftWorlds", .world),
+            ("behavior_packs", .behaviorPack),
+            ("resource_packs", .resourcePack),
+            ("skin_packs", .skinPack),
+            ("world_templates", .worldTemplate)
+        ]
+
+        for (folderName, kind) in collectionKinds {
+            if fileManager.fileExists(atPath: normalizedURL.appendingPathComponent(folderName, isDirectory: true).path) {
+                detectedKinds.insert(kind)
+                score += 25
+            }
+        }
+
+        if fileManager.fileExists(atPath: normalizedURL.appendingPathComponent("db", isDirectory: true).path)
+            || fileManager.fileExists(atPath: normalizedURL.appendingPathComponent("levelname.txt").path) {
+            detectedKinds.insert(.world)
+            score += 35
+        }
+
+        guard score > 0 else {
+            return nil
+        }
+
+        let confidence: SourceProbeConfidence = score >= 50 ? .strong : .medium
+        return SourceProbeResult(
+            providerID: providerID,
+            edition: .bedrock,
+            confidence: confidence,
+            sourceRootURL: normalizedURL,
+            displayName: normalizedURL.lastPathComponent,
+            detectedKinds: detectedKinds,
+            warnings: []
+        )
+    }
+
     nonisolated static func discoverItems(
         in searchRootURL: URL,
         onDiscovered: @Sendable (MinecraftContentItem) -> Void = { _ in }
@@ -583,6 +626,52 @@ private actor PackReferenceIndexStore {
 }
 
 enum JavaContentScanner {
+    nonisolated static func probeLocalFolder(_ url: URL, providerID: PlatformProviderID) -> SourceProbeResult? {
+        let fileManager = FileManager.default
+        let candidates = localFolderProbeCandidates(for: url.standardizedFileURL, fileManager: fileManager)
+        let scoredCandidates = candidates.compactMap { candidate -> (url: URL, score: Int, kinds: Set<MinecraftContentKind>)? in
+            let score = javaProbeScore(for: candidate, fileManager: fileManager)
+            guard score.value > 0 else {
+                return nil
+            }
+
+            return (candidate, score.value, score.kinds)
+        }
+
+        guard let best = scoredCandidates.max(by: { lhs, rhs in
+            if lhs.score != rhs.score {
+                return lhs.score < rhs.score
+            }
+
+            return lhs.url.path.count > rhs.url.path.count
+        }) else {
+            return nil
+        }
+
+        let confidence: SourceProbeConfidence
+        if best.score >= 70 {
+            confidence = .exact
+        } else if best.score >= 45 {
+            confidence = .strong
+        } else {
+            confidence = .medium
+        }
+
+        let warnings = best.url.standardizedFileURL == url.standardizedFileURL ? [] : [
+            "Using nested Java instance folder: \(best.url.lastPathComponent)"
+        ]
+
+        return SourceProbeResult(
+            providerID: providerID,
+            edition: .java,
+            confidence: confidence,
+            sourceRootURL: best.url.standardizedFileURL,
+            displayName: best.url.lastPathComponent,
+            detectedKinds: best.kinds,
+            warnings: warnings
+        )
+    }
+
     nonisolated static func discoverItems(
         in searchRootURL: URL,
         onDiscovered: @Sendable (MinecraftContentItem) -> Void = { _ in }
@@ -603,14 +692,50 @@ enum JavaContentScanner {
             discoveredItems.append(contentsOf: resourcePackItems)
         }
 
+        if let dataPacksURL = existingDirectory(named: "datapacks", in: searchRootURL, fileManager: fileManager) {
+            discoveredItems.append(contentsOf: try discoverJavaPackages(
+                in: dataPacksURL,
+                contentKind: .dataPack,
+                platformType: .dataPack,
+                packageExtension: "zip",
+                fileManager: fileManager
+            ))
+        }
+
+        if let shaderPacksURL = existingDirectory(named: "shaderpacks", in: searchRootURL, fileManager: fileManager) {
+            discoveredItems.append(contentsOf: try discoverJavaPackages(
+                in: shaderPacksURL,
+                contentKind: .shaderPack,
+                platformType: .shaderPack,
+                packageExtension: "zip",
+                fileManager: fileManager
+            ))
+        }
+
+        if let modsURL = existingDirectory(named: "mods", in: searchRootURL, fileManager: fileManager) {
+            discoveredItems.append(contentsOf: try discoverJavaPackages(
+                in: modsURL,
+                contentKind: .mod,
+                platformType: .mod,
+                packageExtension: "jar",
+                fileManager: fileManager
+            ))
+        }
+
         discoveredItems.sort(by: WorldScanner.sortItems)
         discoveredItems.forEach(onDiscovered)
         return discoveredItems
     }
 
-    nonisolated static func enrich(item: MinecraftContentItem) -> MinecraftContentItem {
+    nonisolated static func enrich(item: MinecraftContentItem) async -> MinecraftContentItem {
         var enrichedItem = item
-        enrichedItem.displayName = displayName(for: item)
+        let metadata = JavaContentMetadataReader.metadata(for: item)
+        enrichedItem.displayName = metadata?.displayName ?? displayName(for: item)
+        enrichedItem.iconURL = await JavaContentMetadataReader.cachedIconURL(for: item, metadata: metadata)
+        if let packMetadata = metadata?.pack {
+            enrichedItem.platformMetadata = .java(JavaContentMetadata(pack: packMetadata))
+        }
+        enrichedItem.hasKnownIcon = enrichedItem.iconURL != nil
         enrichedItem.modifiedDate = WorldScanner.modifiedDate(for: item.folderURL)
         enrichedItem.metadataLoaded = true
         enrichedItem.previewLoaded = true
@@ -620,7 +745,7 @@ enum JavaContentScanner {
 
     nonisolated static func loadSize(for item: MinecraftContentItem) -> MinecraftContentItem {
         var sizedItem = item
-        sizedItem.sizeBytes = WorldScanner.folderSize(at: item.folderURL, fileManager: .default)
+        sizedItem.sizeBytes = contentSize(at: item.folderURL, fileManager: .default)
         sizedItem.sizeLoaded = true
         return sizedItem
     }
@@ -629,7 +754,10 @@ enum JavaContentScanner {
         let fileManager = FileManager.default
         let candidateRoots = [
             existingDirectory(named: "saves", in: sourceRootURL, fileManager: fileManager),
-            existingDirectory(named: "resourcepacks", in: sourceRootURL, fileManager: fileManager)
+            existingDirectory(named: "resourcepacks", in: sourceRootURL, fileManager: fileManager),
+            existingDirectory(named: "datapacks", in: sourceRootURL, fileManager: fileManager),
+            existingDirectory(named: "shaderpacks", in: sourceRootURL, fileManager: fileManager),
+            existingDirectory(named: "mods", in: sourceRootURL, fileManager: fileManager)
         ]
 
         return candidateRoots.compactMap { collectionURL in
@@ -663,22 +791,53 @@ enum JavaContentScanner {
     }
 
     nonisolated private static func discoverResourcePacks(in resourcePacksURL: URL, fileManager: FileManager) throws -> [MinecraftContentItem] {
-        let directories = try WorldScanner.immediateChildDirectories(of: resourcePacksURL, fileManager: fileManager)
-        return directories.compactMap { packURL in
-            guard fileManager.fileExists(atPath: packURL.appendingPathComponent("pack.mcmeta").path) else {
+        try discoverJavaPackages(
+            in: resourcePacksURL,
+            contentKind: .resourcePack,
+            platformType: .resourcePack,
+            packageExtension: "zip",
+            fileManager: fileManager,
+            folderMarker: "pack.mcmeta"
+        )
+    }
+
+    nonisolated private static func discoverJavaPackages(
+        in collectionURL: URL,
+        contentKind: MinecraftContentKind,
+        platformType: JavaContentType,
+        packageExtension: String,
+        fileManager: FileManager,
+        folderMarker: String? = nil
+    ) throws -> [MinecraftContentItem] {
+        let children = try fileManager.contentsOfDirectory(
+            at: collectionURL,
+            includingPropertiesForKeys: [.isDirectoryKey, .isRegularFileKey],
+            options: [.skipsHiddenFiles]
+        )
+
+        return children.compactMap { childURL in
+            let values = try? childURL.resourceValues(forKeys: [.isDirectoryKey, .isRegularFileKey])
+            let isDirectory = values?.isDirectory == true
+            let isRegularFile = values?.isRegularFile == true
+
+            if isDirectory {
+                if let folderMarker,
+                   !fileManager.fileExists(atPath: childURL.appendingPathComponent(folderMarker).path) {
+                    return nil
+                }
+            } else if isRegularFile {
+                guard childURL.pathExtension.localizedCaseInsensitiveCompare(packageExtension) == .orderedSame else {
+                    return nil
+                }
+            } else {
                 return nil
             }
 
-            return MinecraftContentItem(
-                folderURL: packURL,
-                folderName: packURL.lastPathComponent,
-                contentType: .resourcePack,
-                sourceEdition: .java,
-                contentKind: .resourcePack,
-                platformType: .java(.resourcePack),
-                collectionRootURL: resourcePacksURL,
-                capabilities: .java(contentType: .resourcePack),
-                platformMetadata: .java(JavaContentMetadata())
+            return javaContentItem(
+                url: childURL,
+                contentKind: contentKind,
+                platformType: platformType,
+                collectionRootURL: collectionURL
             )
         }
     }
@@ -692,6 +851,86 @@ enum JavaContentScanner {
         return directoryURL
     }
 
+    nonisolated private static func javaContentItem(
+        url: URL,
+        contentKind: MinecraftContentKind,
+        platformType: JavaContentType,
+        collectionRootURL: URL
+    ) -> MinecraftContentItem {
+        MinecraftContentItem(
+            folderURL: url,
+            folderName: url.lastPathComponent,
+            contentType: contentKind == .world ? .world : .resourcePack,
+            sourceEdition: .java,
+            contentKind: contentKind,
+            platformType: .java(platformType),
+            collectionRootURL: collectionRootURL,
+            displayName: url.deletingPathExtension().lastPathComponent,
+            capabilities: .java(contentType: platformType),
+            platformMetadata: .java(JavaContentMetadata())
+        )
+    }
+
+    nonisolated private static func contentSize(at url: URL, fileManager: FileManager) -> Int64? {
+        let values = try? url.resourceValues(forKeys: [.isDirectoryKey, .fileSizeKey])
+        if values?.isDirectory == true {
+            return WorldScanner.folderSize(at: url, fileManager: fileManager)
+        }
+
+        return values?.fileSize.map(Int64.init)
+    }
+
+    nonisolated private static func localFolderProbeCandidates(for url: URL, fileManager: FileManager) -> [URL] {
+        var candidates = [url]
+        let children = (try? fileManager.contentsOfDirectory(
+            at: url,
+            includingPropertiesForKeys: [.isDirectoryKey],
+            options: [.skipsHiddenFiles]
+        )) ?? []
+        candidates.append(contentsOf: children.filter {
+            (try? $0.resourceValues(forKeys: [.isDirectoryKey]).isDirectory) == true
+        })
+        return candidates
+    }
+
+    nonisolated private static func javaProbeScore(for url: URL, fileManager: FileManager) -> (value: Int, kinds: Set<MinecraftContentKind>) {
+        var score = 0
+        var kinds = Set<MinecraftContentKind>()
+
+        if existingDirectory(named: "saves", in: url, fileManager: fileManager) != nil {
+            kinds.insert(.world)
+            score += 25
+        }
+        if existingDirectory(named: "resourcepacks", in: url, fileManager: fileManager) != nil {
+            kinds.insert(.resourcePack)
+            score += 20
+        }
+        if existingDirectory(named: "datapacks", in: url, fileManager: fileManager) != nil {
+            kinds.insert(.dataPack)
+            score += 15
+        }
+        if existingDirectory(named: "shaderpacks", in: url, fileManager: fileManager) != nil {
+            kinds.insert(.shaderPack)
+            score += 15
+        }
+        if existingDirectory(named: "mods", in: url, fileManager: fileManager) != nil {
+            kinds.insert(.mod)
+            score += 20
+        }
+        if fileManager.fileExists(atPath: url.appendingPathComponent("options.txt").path)
+            || fileManager.fileExists(atPath: url.appendingPathComponent("launcher_profiles.json").path)
+            || fileManager.fileExists(atPath: url.appendingPathComponent(".curseclient").path) {
+            score += 15
+        }
+        if fileManager.fileExists(atPath: url.appendingPathComponent("region", isDirectory: true).path)
+            && fileManager.fileExists(atPath: url.appendingPathComponent("level.dat").path) {
+            kinds.insert(.world)
+            score += 35
+        }
+
+        return (score, kinds)
+    }
+
     nonisolated private static func collectionSnapshot(
         for collectionURL: URL,
         fileManager: FileManager
@@ -702,35 +941,41 @@ enum JavaContentScanner {
 
         let children = (try? fileManager.contentsOfDirectory(
             at: collectionURL,
-            includingPropertiesForKeys: [.isDirectoryKey, .contentModificationDateKey],
+            includingPropertiesForKeys: [.isDirectoryKey, .isRegularFileKey, .contentModificationDateKey, .fileSizeKey],
             options: [.skipsHiddenFiles]
         )) ?? []
-        let childDirectorySnapshots = children.compactMap { childURL -> (name: String, modifiedDate: Date?)? in
-            guard (try? childURL.resourceValues(forKeys: [.isDirectoryKey]).isDirectory) == true else {
+        let childSnapshots = children.compactMap { childURL -> (name: String, modifiedDate: Date?, size: Int?)? in
+            let values = try? childURL.resourceValues(forKeys: [
+                .isDirectoryKey,
+                .isRegularFileKey,
+                .contentModificationDateKey,
+                .fileSizeKey
+            ])
+            guard values?.isDirectory == true || values?.isRegularFile == true else {
                 return nil
             }
 
-            let modifiedDate = try? childURL.resourceValues(forKeys: [.contentModificationDateKey]).contentModificationDate
-            return (childURL.lastPathComponent, modifiedDate)
+            return (childURL.lastPathComponent, values?.contentModificationDate, values?.fileSize)
         }.sorted {
             $0.name.localizedStandardCompare($1.name) == .orderedAscending
         }
 
         let modifiedDate = try? collectionURL.resourceValues(forKeys: [.contentModificationDateKey]).contentModificationDate
-        let childFingerprint = childDirectorySnapshots.map { child in
+        let childFingerprint = childSnapshots.map { child in
             [
                 child.name,
-                child.modifiedDate?.timeIntervalSince1970.formatted() ?? "nil"
+                child.modifiedDate?.timeIntervalSince1970.formatted() ?? "nil",
+                child.size.map(String.init) ?? "nil"
             ].joined(separator: "@")
         }.joined(separator: "|")
 
         return CollectionSnapshot(
             folderName: collectionURL.lastPathComponent,
             modifiedDate: modifiedDate,
-            childDirectoryCount: childDirectorySnapshots.count,
+            childDirectoryCount: childSnapshots.count,
             fingerprint: [
                 collectionURL.lastPathComponent,
-                String(childDirectorySnapshots.count),
+                String(childSnapshots.count),
                 modifiedDate?.timeIntervalSince1970.formatted() ?? "nil",
                 childFingerprint
             ].joined(separator: "::")

World Manager for Minecraft/Services/ArchiveInspection/JavaContentMetadataReader.swift

@@ -0,0 +1,285 @@
+// SPDX-FileCopyrightText: 2026 John Burwell and contributors
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
+import Foundation
+
+nonisolated struct JavaArchiveMetadata: Hashable, Sendable {
+    var displayName: String?
+    var pack: JavaPackMetadata?
+    var iconEntryPath: String?
+}
+
+enum JavaContentMetadataReader {
+    nonisolated static func metadata(for item: MinecraftContentItem) -> JavaArchiveMetadata? {
+        let values = try? item.folderURL.resourceValues(forKeys: [.isDirectoryKey, .isRegularFileKey])
+        if values?.isDirectory == true {
+            return directoryMetadata(for: item)
+        }
+
+        if values?.isRegularFile == true {
+            return archiveMetadata(for: item.folderURL, contentKind: item.contentKind)
+        }
+
+        return nil
+    }
+
+    nonisolated static func cachedIconURL(for item: MinecraftContentItem, metadata: JavaArchiveMetadata?) async -> URL? {
+        let values = try? item.folderURL.resourceValues(forKeys: [.isDirectoryKey, .isRegularFileKey])
+        if values?.isDirectory == true {
+            return await ImageCacheStore.shared.cachedImageURL(for: directoryIconURL(for: item))
+        }
+
+        guard
+            values?.isRegularFile == true,
+            let metadata,
+            let iconEntryPath = metadata.iconEntryPath,
+            let archive = try? ZipArchiveReader(url: item.folderURL),
+            let entry = archive.entry(named: iconEntryPath),
+            let data = try? archive.extract(entry)
+        else {
+            return nil
+        }
+
+        return await ImageCacheStore.shared.cachedImageURL(
+            forRemoteData: data,
+            cacheKey: "java-archive-icon:\(item.folderURL.standardizedFileURL.path):\(iconEntryPath)",
+            pathExtension: URL(fileURLWithPath: iconEntryPath).pathExtension
+        )
+    }
+
+    nonisolated private static func directoryMetadata(for item: MinecraftContentItem) -> JavaArchiveMetadata {
+        let pack = packMetadata(from: item.folderURL.appendingPathComponent("pack.mcmeta"))
+        let iconURL = directoryIconURL(for: item)
+
+        return JavaArchiveMetadata(
+            displayName: nil,
+            pack: pack,
+            iconEntryPath: iconURL?.lastPathComponent
+        )
+    }
+
+    nonisolated private static func archiveMetadata(for archiveURL: URL, contentKind: MinecraftContentKind) -> JavaArchiveMetadata? {
+        guard let archive = try? ZipArchiveReader(url: archiveURL) else {
+            return nil
+        }
+
+        let pack = packMetadata(from: archive)
+        let modMetadata = contentKind == .mod ? modMetadata(from: archive) : nil
+        let iconEntryPath = iconEntryPath(
+            in: archive,
+            preferredPath: modMetadata?.iconPath,
+            contentKind: contentKind
+        )
+
+        return JavaArchiveMetadata(
+            displayName: modMetadata?.displayName,
+            pack: pack,
+            iconEntryPath: iconEntryPath
+        )
+    }
+
+    nonisolated private static func directoryIconURL(for item: MinecraftContentItem) -> URL? {
+        let candidateNames: [String]
+        switch item.contentKind {
+        case .mod:
+            candidateNames = ["icon.png", "logo.png", "mod_logo.png", "catalogue_icon.png", "pack.png"]
+        case .resourcePack, .dataPack, .shaderPack:
+            candidateNames = ["pack.png", "icon.png", "logo.png"]
+        case .world, .behaviorPack, .skinPack, .worldTemplate:
+            candidateNames = ["icon.png", "pack.png"]
+        }
+
+        for candidateName in candidateNames {
+            let candidateURL = item.folderURL.appendingPathComponent(candidateName)
+            if FileManager.default.fileExists(atPath: candidateURL.path) {
+                return candidateURL
+            }
+        }
+
+        return nil
+    }
+
+    nonisolated private static func packMetadata(from metadataURL: URL) -> JavaPackMetadata? {
+        guard let data = try? Data(contentsOf: metadataURL) else {
+            return nil
+        }
+
+        return packMetadata(from: data)
+    }
+
+    nonisolated private static func packMetadata(from archive: ZipArchiveReader) -> JavaPackMetadata? {
+        guard
+            let entry = archive.entry(named: "pack.mcmeta"),
+            let data = try? archive.extract(entry)
+        else {
+            return nil
+        }
+
+        return packMetadata(from: data)
+    }
+
+    nonisolated private static func packMetadata(from data: Data) -> JavaPackMetadata? {
+        guard
+            let jsonObject = try? JSONSerialization.jsonObject(with: data) as? [String: Any],
+            let packObject = jsonObject["pack"] as? [String: Any]
+        else {
+            return nil
+        }
+
+        return JavaPackMetadata(
+            packFormat: packObject["pack_format"] as? Int,
+            description: textValue(from: packObject["description"])
+        )
+    }
+
+    nonisolated private static func modMetadata(from archive: ZipArchiveReader) -> (displayName: String?, iconPath: String?)? {
+        if let tomlMetadata = modTOMLMetadata(from: archive) {
+            return tomlMetadata
+        }
+
+        if let jsonMetadata = modJSONMetadata(from: archive, entryName: "fabric.mod.json") {
+            return jsonMetadata
+        }
+
+        if let jsonMetadata = modJSONMetadata(from: archive, entryName: "quilt.mod.json") {
+            return jsonMetadata
+        }
+
+        return nil
+    }
+
+    nonisolated private static func modTOMLMetadata(from archive: ZipArchiveReader) -> (displayName: String?, iconPath: String?)? {
+        let entryNames = ["META-INF/neoforge.mods.toml", "META-INF/mods.toml"]
+        for entryName in entryNames {
+            guard
+                let entry = archive.entry(named: entryName),
+                let data = try? archive.extract(entry),
+                let text = String(data: data, encoding: .utf8)
+            else {
+                continue
+            }
+
+            let firstModSection = firstTOMLSection(named: "[[mods]]", in: text)
+            let displayName = tomlStringValue(forKey: "displayName", in: firstModSection)
+            let logoFile = tomlStringValue(forKey: "logoFile", in: firstModSection)
+            if displayName != nil || logoFile != nil {
+                return (displayName, logoFile)
+            }
+        }
+
+        return nil
+    }
+
+    nonisolated private static func modJSONMetadata(
+        from archive: ZipArchiveReader,
+        entryName: String
+    ) -> (displayName: String?, iconPath: String?)? {
+        guard
+            let entry = archive.entry(named: entryName),
+            let data = try? archive.extract(entry),
+            let jsonObject = try? JSONSerialization.jsonObject(with: data) as? [String: Any]
+        else {
+            return nil
+        }
+
+        let iconPath: String?
+        if let iconString = jsonObject["icon"] as? String {
+            iconPath = iconString
+        } else if let icons = jsonObject["icon"] as? [String: String] {
+            iconPath = icons.sorted { lhs, rhs in lhs.key.localizedStandardCompare(rhs.key) == .orderedDescending }.first?.value
+        } else {
+            iconPath = nil
+        }
+
+        return (
+            (jsonObject["name"] as? String)?.nilIfBlank,
+            iconPath?.nilIfBlank
+        )
+    }
+
+    nonisolated private static func firstTOMLSection(named sectionName: String, in text: String) -> String {
+        guard let sectionRange = text.range(of: sectionName) else {
+            return text
+        }
+
+        let sectionText = text[sectionRange.upperBound...]
+        if let nextSectionRange = sectionText.range(of: "\n[") {
+            return String(sectionText[..<nextSectionRange.lowerBound])
+        }
+
+        return String(sectionText)
+    }
+
+    nonisolated private static func tomlStringValue(forKey key: String, in text: String) -> String? {
+        for rawLine in text.components(separatedBy: .newlines) {
+            let line = rawLine.trimmingCharacters(in: .whitespacesAndNewlines)
+            guard line.hasPrefix(key) else {
+                continue
+            }
+
+            let parts = line.split(separator: "=", maxSplits: 1).map(String.init)
+            guard parts.count == 2 else {
+                continue
+            }
+
+            return parts[1]
+                .trimmingCharacters(in: .whitespacesAndNewlines)
+                .trimmingCharacters(in: CharacterSet(charactersIn: "\"'"))
+                .nilIfBlank
+        }
+
+        return nil
+    }
+
+    nonisolated private static func iconEntryPath(
+        in archive: ZipArchiveReader,
+        preferredPath: String?,
+        contentKind: MinecraftContentKind
+    ) -> String? {
+        let candidateNames: [String]
+        switch contentKind {
+        case .mod:
+            candidateNames = [preferredPath, "icon.png", "logo.png", "mod_logo.png", "catalogue_icon.png", "pack.png"].compactMap(\.self)
+        case .resourcePack, .dataPack, .shaderPack:
+            candidateNames = [preferredPath, "pack.png", "icon.png", "logo.png"].compactMap(\.self)
+        case .world, .behaviorPack, .skinPack, .worldTemplate:
+            candidateNames = [preferredPath, "icon.png", "pack.png"].compactMap(\.self)
+        }
+
+        for candidateName in candidateNames {
+            if let entry = archive.entry(named: candidateName), !entry.isDirectory {
+                return entry.path
+            }
+        }
+
+        return archive.entries
+            .filter { !$0.isDirectory && $0.path.localizedCaseInsensitiveContains("icon") && $0.path.hasSuffix(".png") }
+            .sorted { lhs, rhs in lhs.path.localizedStandardCompare(rhs.path) == .orderedAscending }
+            .first?
+            .path
+    }
+
+    nonisolated private static func textValue(from value: Any?) -> String? {
+        if let text = value as? String {
+            return text.nilIfBlank
+        }
+
+        if let object = value as? [String: Any] {
+            if let text = object["text"] as? String {
+                return text.nilIfBlank
+            }
+            if let translate = object["translate"] as? String {
+                return translate.nilIfBlank
+            }
+        }
+
+        return nil
+    }
+}
+
+private extension String {
+    nonisolated var nilIfBlank: String? {
+        let trimmed = trimmingCharacters(in: .whitespacesAndNewlines)
+        return trimmed.isEmpty ? nil : trimmed
+    }
+}

World Manager for Minecraft/Services/Sources/Core/SourceLibrary.swift

@@ -137,32 +137,53 @@ final class SourceLibrary: ObservableObject, SourceScanSessionHosting, SourcePer
         )
     }
 
-    func addSource(at url: URL) -> URL {
-        let normalizedURL = url.standardizedFileURL
-        let bookmarkData = securityScopedBookmarkData(for: normalizedURL)
+    func addSource(at url: URL) async -> URL {
+        let selectedURL = url.standardizedFileURL
+        let probe = await sourceAccessMethod.probeLocalFolder(selectedURL)
+        let normalizedURL = (probe?.sourceRootURL ?? selectedURL).standardizedFileURL
+        let bookmarkData = securityScopedBookmarkData(for: normalizedURL) ?? securityScopedBookmarkData(for: selectedURL)
+        let providerID = probe?.providerID ?? LocalFolderSourceAccess().accessorIdentifier
+        let edition = probe?.edition ?? .bedrock
 
         if sources.contains(where: { $0.id == normalizedURL }) {
             updateSource(normalizedURL) { source in
                 if source.bookmarkData == nil {
                     source.bookmarkData = bookmarkData
                 }
-                source.accessDescriptor = sourceAccessMethod.accessDescriptor(for: source)
-                source.providerID = source.accessDescriptor.accessorIdentifier
+                source.accessDescriptor = SourceAccessDescriptor(
+                    accessorIdentifier: providerID,
+                    kind: .localFolder,
+                    refreshStrategy: .eagerFullScan
+                )
+                source.providerID = providerID
+                source.edition = edition
                 source.capabilities = source.origin.defaultCapabilities
+                if let probe {
+                    source.displayName = probe.displayName
+                    if let warning = probe.warnings.first {
+                        source.scanDiagnostic = warning
+                    }
+                }
             }
             startScan(for: normalizedURL, mode: .fullScan)
             return normalizedURL
         }
 
-        let source = MinecraftSource(
+        var source = MinecraftSource(
             folderURL: normalizedURL,
             bookmarkData: bookmarkData,
             accessDescriptor: SourceAccessDescriptor(
-                accessorIdentifier: LocalFolderSourceAccess().accessorIdentifier,
+                accessorIdentifier: providerID,
                 kind: .localFolder,
                 refreshStrategy: .eagerFullScan
             )
         )
+        source.providerID = providerID
+        source.edition = edition
+        source.displayName = probe?.displayName ?? normalizedURL.lastPathComponent
+        if let warning = probe?.warnings.first {
+            source.scanDiagnostic = warning
+        }
         return addSource(source, shouldPersist: true, shouldScan: true)
     }
 
@@ -173,7 +194,7 @@ final class SourceLibrary: ObservableObject, SourceScanSessionHosting, SourcePer
                 existingSource.origin = source.origin
                 existingSource.accessDescriptor = source.accessDescriptor
                 existingSource.providerID = source.accessDescriptor.accessorIdentifier
-                existingSource.edition = source.origin.defaultEdition
+                existingSource.edition = source.edition
                 existingSource.accessStatus = source.origin.defaultAccessStatus(displayName: source.displayName)
                 existingSource.availability = source.availability
                 existingSource.capabilities = source.capabilities
@@ -188,7 +209,7 @@ final class SourceLibrary: ObservableObject, SourceScanSessionHosting, SourcePer
             var resolvedSource = source
             resolvedSource.accessDescriptor = sourceAccessMethod.accessDescriptor(for: resolvedSource)
             resolvedSource.providerID = resolvedSource.accessDescriptor.accessorIdentifier
-            resolvedSource.edition = resolvedSource.origin.defaultEdition
+            resolvedSource.edition = source.edition
             resolvedSource.accessStatus = resolvedSource.origin.defaultAccessStatus(displayName: resolvedSource.displayName)
             resolvedSource.capabilities = resolvedSource.origin.defaultCapabilities
             sources.append(resolvedSource)
@@ -441,8 +462,13 @@ final class SourceLibrary: ObservableObject, SourceScanSessionHosting, SourcePer
         await ConnectedDeviceRuntime.refreshDevices(on: self, using: connectedDeviceAccessMethod)
     }
 
-    func currentCollectionSnapshots(for sourceURL: URL) -> [CollectionSnapshot] {
-        WorldScanner.collectionSnapshots(in: sourceURL)
+    func currentCollectionSnapshots(for sourceURL: URL, edition: MinecraftEdition) -> [CollectionSnapshot] {
+        switch edition {
+        case .bedrock:
+            return WorldScanner.collectionSnapshots(in: sourceURL)
+        case .java:
+            return JavaContentScanner.collectionSnapshots(in: sourceURL)
+        }
     }
 
     func connectedDeviceDisplayName(for device: ConnectedDevice, container: DeviceAppContainer) -> String {

World Manager for Minecraft/Services/Sources/Local/SourceLocalRuntime.swift

@@ -12,7 +12,7 @@ protocol LocalSourceRuntimeHosting: AnyObject {
     func source(withID sourceID: URL) -> MinecraftSource?
     func updateAvailability(for sourceID: URL, to newAvailability: SourceAvailability) -> (previous: SourceAvailability, becameAvailable: Bool)
     func queueAutomaticSync(for sourceID: URL, reason: String, debounce: TimeInterval?)
-    func currentCollectionSnapshots(for sourceURL: URL) -> [CollectionSnapshot]
+    func currentCollectionSnapshots(for sourceURL: URL, edition: MinecraftEdition) -> [CollectionSnapshot]
 }
 
 enum LocalSourceRuntime {
@@ -86,7 +86,7 @@ enum LocalSourceRuntime {
 
             if SourceRestoration.needsReconcile(
                 refreshedSource,
-                currentCollectionSnapshots: host.currentCollectionSnapshots(for:)
+                currentCollectionSnapshots: host.currentCollectionSnapshots(for:edition:)
             ) {
                 host.queueAutomaticSync(
                     for: sourceID,

World Manager for Minecraft/Services/Sources/Persistence/SourcePersistenceCoordinator.swift

@@ -15,7 +15,7 @@ protocol SourcePersistenceHosting: AnyObject {
     func refreshConnectedDevices() async
     func refreshLocalSources() async
     func queueAutomaticSync(for sourceID: URL, reason: String, debounce: TimeInterval?)
-    func currentCollectionSnapshots(for sourceURL: URL) -> [CollectionSnapshot]
+    func currentCollectionSnapshots(for sourceURL: URL, edition: MinecraftEdition) -> [CollectionSnapshot]
     func connectedDeviceDisplayName(for device: ConnectedDevice, container: DeviceAppContainer) -> String
 }
 
@@ -125,7 +125,7 @@ enum SourcePersistenceCoordinator {
             if let refreshReason = SourceRestoration.startupRefreshReason(
                 for: source,
                 persistedRecord: persistedRecordsByID[source.id],
-                currentCollectionSnapshots: host.currentCollectionSnapshots(for:)
+                currentCollectionSnapshots: host.currentCollectionSnapshots(for:edition:)
             ) {
                 host.queueAutomaticSync(for: source.id, reason: refreshReason, debounce: nil)
             }

World Manager for Minecraft/Services/Sources/Persistence/SourceRestoration.swift

@@ -16,6 +16,8 @@ enum SourceRestoration {
             accessDescriptor: record.accessDescriptor,
             availability: record.availability
         )
+        source.providerID = record.accessDescriptor.accessorIdentifier
+        source.edition = edition(for: record.accessDescriptor, origin: record.origin)
 
         if case .connectedDevice(let device, let container) = source.origin {
             var repairedDevice = device
@@ -104,7 +106,7 @@ enum SourceRestoration {
     static func startupRefreshReason(
         for source: MinecraftSource,
         persistedRecord: PersistedSourceRecord?,
-        currentCollectionSnapshots: (URL) -> [CollectionSnapshot]
+        currentCollectionSnapshots: (URL, MinecraftEdition) -> [CollectionSnapshot]
     ) -> String? {
         guard source.availability == .available else {
             return nil
@@ -133,7 +135,7 @@ enum SourceRestoration {
 
     static func needsReconcile(
         _ source: MinecraftSource,
-        currentCollectionSnapshots: (URL) -> [CollectionSnapshot]
+        currentCollectionSnapshots: (URL, MinecraftEdition) -> [CollectionSnapshot]
     ) -> Bool {
         reconcileIsNeeded(source, currentCollectionSnapshots: currentCollectionSnapshots)
     }
@@ -152,7 +154,7 @@ enum SourceRestoration {
 
     private static func needsRescan(
         _ record: PersistedSourceRecord,
-        currentCollectionSnapshots: (URL) -> [CollectionSnapshot]
+        currentCollectionSnapshots: (URL, MinecraftEdition) -> [CollectionSnapshot]
     ) -> Bool {
         guard record.accessDescriptor.refreshStrategy == .eagerFullScan else {
             return record.rawItems.isEmpty
@@ -167,15 +169,16 @@ enum SourceRestoration {
             return true
         }
 
+        let edition = edition(for: record.accessDescriptor, origin: record.origin)
         return collectionsDiffer(
-            currentCollectionSnapshots(sourceURL),
+            currentCollectionSnapshots(sourceURL, edition),
             persistedCollections: snapshot.collectionSnapshots
         )
     }
 
     private static func reconcileIsNeeded(
         _ source: MinecraftSource,
-        currentCollectionSnapshots: (URL) -> [CollectionSnapshot]
+        currentCollectionSnapshots: (URL, MinecraftEdition) -> [CollectionSnapshot]
     ) -> Bool {
         guard source.accessDescriptor.refreshStrategy == .eagerFullScan else {
             return source.rawItems.isEmpty
@@ -191,11 +194,22 @@ enum SourceRestoration {
         }
 
         return collectionsDiffer(
-            currentCollectionSnapshots(sourceURL),
+            currentCollectionSnapshots(sourceURL, source.edition),
             persistedCollections: snapshot.collectionSnapshots
         )
     }
 
+    private static func edition(
+        for accessDescriptor: SourceAccessDescriptor,
+        origin: MinecraftSourceOrigin
+    ) -> MinecraftEdition {
+        if accessDescriptor.accessorIdentifier == JavaLocalFolderSourceAccess().accessorIdentifier {
+            return .java
+        }
+
+        return origin.defaultEdition
+    }
+
     private static func collectionsDiffer(
         _ currentCollections: [CollectionSnapshot],
         persistedCollections: [CollectionSnapshot]

World Manager for Minecraft/SourceAccess/Core/SourceAccessCoordinator.swift

@@ -10,6 +10,7 @@ enum SourceDiscoveryMode: Sendable {
 
 protocol SourceAccessMethod: Sendable {
     nonisolated var accessorIdentifier: SourceAccessorIdentifier { get }
+    nonisolated func probeLocalFolder(_ url: URL) async -> SourceProbeResult?
     nonisolated func accessDescriptor(for source: MinecraftSource) -> SourceAccessDescriptor
     nonisolated func accessStatus(for source: MinecraftSource) async -> SourceAccessStatus
     nonisolated func availability(for source: MinecraftSource) async -> SourceAvailability
@@ -38,6 +39,11 @@ extension SourceAccessMethod {
         String(reflecting: Self.self)
     }
 
+    nonisolated func probeLocalFolder(_ url: URL) async -> SourceProbeResult? {
+        _ = url
+        return nil
+    }
+
     nonisolated func accessDescriptor(for source: MinecraftSource) -> SourceAccessDescriptor {
         SourceAccessDescriptor(
             accessorIdentifier: accessorIdentifier,
@@ -221,6 +227,30 @@ struct SourceAccessCoordinator: SourceAccessMethod {
         fatalError("No source access method is registered for \(source.accessDescriptor.accessorIdentifier).")
     }
 
+    nonisolated func probeLocalFolder(_ url: URL) async -> SourceProbeResult? {
+        var bestProbe: SourceProbeResult?
+
+        for accessMethod in accessMethodsByIdentifier.values {
+            guard let probe = await accessMethod.probeLocalFolder(url) else {
+                continue
+            }
+
+            guard probe.confidence > .none else {
+                continue
+            }
+
+            if let currentBest = bestProbe {
+                if probe.confidence > currentBest.confidence {
+                    bestProbe = probe
+                }
+            } else {
+                bestProbe = probe
+            }
+        }
+
+        return bestProbe
+    }
+
     nonisolated func discoverItems(
         for source: MinecraftSource,
         mode: SourceDiscoveryMode,

World Manager for Minecraft/SourceAccess/LocalFolder/LocalFolderSourceAccess.swift

@@ -10,6 +10,10 @@ struct BedrockLocalFolderSourceAccess: SourceAccessMethod {
 
     nonisolated init() {}
 
+    nonisolated func probeLocalFolder(_ url: URL) async -> SourceProbeResult? {
+        BedrockContentScanner.probeLocalFolder(url, providerID: accessorIdentifier)
+    }
+
     nonisolated func accessDescriptor(for source: MinecraftSource) -> SourceAccessDescriptor {
         _ = source
         return SourceAccessDescriptor(
@@ -214,6 +218,10 @@ struct JavaLocalFolderSourceAccess: SourceAccessMethod {
 
     nonisolated init() {}
 
+    nonisolated func probeLocalFolder(_ url: URL) async -> SourceProbeResult? {
+        JavaContentScanner.probeLocalFolder(url, providerID: accessorIdentifier)
+    }
+
     nonisolated func accessDescriptor(for source: MinecraftSource) -> SourceAccessDescriptor {
         _ = source
         return SourceAccessDescriptor(
@@ -226,8 +234,15 @@ struct JavaLocalFolderSourceAccess: SourceAccessMethod {
     nonisolated func accessStatus(for source: MinecraftSource) async -> SourceAccessStatus {
         let candidateURL: URL
         let mode: SourceAccessMode
-        if case .javaLocalFolder(let bookmarkData) = source.origin,
-           let bookmarkData {
+        let bookmarkData: Data?
+        switch source.origin {
+        case .javaLocalFolder(let data), .localFolder(let data):
+            bookmarkData = data
+        case .connectedDevice:
+            bookmarkData = nil
+        }
+
+        if let bookmarkData {
             mode = .securityScopedLocalFolder
             var isStale = false
             if let resolvedURL = try? URL(
@@ -267,7 +282,11 @@ struct JavaLocalFolderSourceAccess: SourceAccessMethod {
         onDiscovered: @escaping @Sendable (MinecraftContentItem) -> Void
     ) async throws {
         _ = mode
-        guard case .javaLocalFolder(let bookmarkData) = source.origin else {
+        let bookmarkData: Data?
+        switch source.origin {
+        case .javaLocalFolder(let data), .localFolder(let data):
+            bookmarkData = data
+        case .connectedDevice:
             throw SourceAccessError.accessFailed(
                 reason: "No Java local-folder access method is configured for this source type."
             )
@@ -304,7 +323,7 @@ struct JavaLocalFolderSourceAccess: SourceAccessMethod {
 
     nonisolated func enrich(_ item: MinecraftContentItem, for source: MinecraftSource) async -> MinecraftContentItem {
         _ = source
-        return JavaContentScanner.enrich(item: item)
+        return await JavaContentScanner.enrich(item: item)
     }
 
     nonisolated func loadSize(for item: MinecraftContentItem, in source: MinecraftSource) async -> MinecraftContentItem {
@@ -314,6 +333,11 @@ struct JavaLocalFolderSourceAccess: SourceAccessMethod {
 
     nonisolated func listItemContents(for item: MinecraftContentItem, in source: MinecraftSource) async throws -> [DirectoryEntry] {
         _ = source
+        let values = try? item.folderURL.resourceValues(forKeys: [.isDirectoryKey])
+        guard values?.isDirectory == true else {
+            return []
+        }
+
         return try await BedrockLocalFolderSourceAccess().listItemContents(for: item, in: source)
     }
 

World Manager for Minecraft/UI/Detail/SourceDetailView.swift

@@ -197,14 +197,26 @@ struct SourceDetailView: View {
     }
 
     private var contentRows: [(String, String)] {
-        [
-            ("Total Items", source.items.count.formatted(.number)),
-            ("Worlds", itemCount(for: .world).formatted(.number)),
-            ("Behavior Packs", itemCount(for: .behaviorPack).formatted(.number)),
-            ("Resource Packs", itemCount(for: .resourcePack).formatted(.number)),
-            ("Skin Packs", itemCount(for: .skinPack).formatted(.number)),
-            ("World Templates", itemCount(for: .worldTemplate).formatted(.number))
+        var rows = [("Total Items", source.items.count.formatted(.number))]
+        let orderedKinds: [(MinecraftContentKind, String)] = [
+            (.world, "Worlds"),
+            (.behaviorPack, "Behavior Packs"),
+            (.resourcePack, "Resource Packs"),
+            (.dataPack, "Data Packs"),
+            (.skinPack, "Skin Packs"),
+            (.worldTemplate, "World Templates"),
+            (.shaderPack, "Shader Packs"),
+            (.mod, "Mods")
         ]
+
+        for (kind, title) in orderedKinds {
+            let count = itemCount(for: kind)
+            if count > 0 || source.edition == .bedrock && bedrockAlwaysDisplayedContentKinds.contains(kind) {
+                rows.append((title, count.formatted(.number)))
+            }
+        }
+
+        return rows
     }
 
     private var locationRows: [(String, String)] {
@@ -485,6 +497,14 @@ struct SourceDetailView: View {
         source.items.filter { $0.contentType == type }.count
     }
 
+    private func itemCount(for kind: MinecraftContentKind) -> Int {
+        source.items.filter { $0.contentKind == kind }.count
+    }
+
+    private var bedrockAlwaysDisplayedContentKinds: Set<MinecraftContentKind> {
+        [.world, .behaviorPack, .resourcePack, .skinPack, .worldTemplate]
+    }
+
     @ViewBuilder
     private func sourceSection(title: String, rows: [(String, String)]) -> some View {
         VStack(alignment: .leading, spacing: 12) {

World Manager for Minecraft/UI/Root/ContentView.swift

@@ -574,8 +574,10 @@ struct ContentView: View {
         }
 
         for url in panel.urls {
-            let sourceID = library.addSource(at: url)
-            selectSourceIfNeeded(sourceID)
+            Task { @MainActor in
+                let sourceID = await library.addSource(at: url)
+                selectSourceIfNeeded(sourceID)
+            }
         }
     }
 
@@ -596,7 +598,7 @@ struct ContentView: View {
                 }
 
                 Task { @MainActor in
-                    let sourceID = library.addSource(at: url)
+                    let sourceID = await library.addSource(at: url)
                     selectSourceIfNeeded(sourceID)
                 }
             }

World Manager for MinecraftTests/World_Manager_for_MinecraftTests.swift

@@ -148,8 +148,12 @@ struct World_Manager_for_MinecraftTests {
     @Test func javaLocalFolderAccessDiscoversWorldsAndResourcePacks() async throws {
         let fileManager = FileManager.default
         let rootURL = fileManager.temporaryDirectory.appendingPathComponent(UUID().uuidString, isDirectory: true)
-        let worldURL = rootURL.appendingPathComponent("saves/JavaWorld", isDirectory: true)
-        let packURL = rootURL.appendingPathComponent("resourcepacks/JavaPack", isDirectory: true)
+        let instanceURL = rootURL.appendingPathComponent("Better MC [NEOFORGE] BMC5", isDirectory: true)
+        let worldURL = instanceURL.appendingPathComponent("saves/JavaWorld", isDirectory: true)
+        let packURL = instanceURL.appendingPathComponent("resourcepacks/JavaPack", isDirectory: true)
+        let zippedPackURL = instanceURL.appendingPathComponent("resourcepacks/JavaPack.zip")
+        let shaderPackURL = instanceURL.appendingPathComponent("shaderpacks/Shader.zip")
+        let modURL = instanceURL.appendingPathComponent("mods/ExampleMod.jar")
         defer { try? fileManager.removeItem(at: rootURL) }
 
         try fileManager.createDirectory(at: worldURL, withIntermediateDirectories: true)
@@ -165,17 +169,35 @@ struct World_Manager_for_MinecraftTests {
             atomically: true,
             encoding: .utf8
         )
+        try fileManager.createDirectory(at: zippedPackURL.deletingLastPathComponent(), withIntermediateDirectories: true)
+        try Data("zip".utf8).write(to: zippedPackURL)
+        try fileManager.createDirectory(at: shaderPackURL.deletingLastPathComponent(), withIntermediateDirectories: true)
+        try Data("shader".utf8).write(to: shaderPackURL)
+        try fileManager.createDirectory(at: modURL.deletingLastPathComponent(), withIntermediateDirectories: true)
+        try Data("jar".utf8).write(to: modURL)
 
-        let source = MinecraftSource(
-            folderURL: rootURL,
-            origin: .javaLocalFolder(bookmarkData: nil)
-        )
         let access = SourceAccessCoordinator(
             accessMethods: [
                 LocalFolderSourceAccess(),
                 JavaLocalFolderSourceAccess()
             ]
         )
+        let probe = await access.probeLocalFolder(rootURL)
+        #expect(probe?.providerID == JavaLocalFolderSourceAccess().accessorIdentifier)
+        #expect(probe?.sourceRootURL == instanceURL.standardizedFileURL)
+        #expect(probe?.detectedKinds.contains(.mod) == true)
+
+        var source = MinecraftSource(
+            folderURL: instanceURL,
+            origin: .localFolder(bookmarkData: nil),
+            accessDescriptor: SourceAccessDescriptor(
+                accessorIdentifier: JavaLocalFolderSourceAccess().accessorIdentifier,
+                kind: .localFolder,
+                refreshStrategy: .eagerFullScan
+            )
+        )
+        source.edition = .java
+        source.providerID = JavaLocalFolderSourceAccess().accessorIdentifier
         var discoveredItems: [MinecraftContentItem] = []
 
         for try await event in access.scanEvents(for: source, mode: .fullScan) {
@@ -188,22 +210,155 @@ struct World_Manager_for_MinecraftTests {
             enrichedItems.append(await access.enrich(item, for: source))
         }
 
-        #expect(discoveredItems.count == 2)
+        #expect(discoveredItems.count == 5)
         #expect(discoveredItems.allSatisfy { $0.sourceEdition == .java })
         #expect(discoveredItems.contains { $0.platformType == .java(.world) && $0.capabilities.portablePackageExtension == "zip" })
         #expect(discoveredItems.contains { $0.platformType == .java(.resourcePack) && $0.contentType == .resourcePack })
+        #expect(discoveredItems.contains { $0.platformType == .java(.shaderPack) && $0.contentKind == .shaderPack })
+        #expect(discoveredItems.contains { $0.platformType == .java(.mod) && $0.contentKind == .mod })
         #expect(enrichedItems.contains { $0.displayName == "Displayed Java World" })
 
         var indexedSource = source
         indexedSource.rawItems = enrichedItems
         let index = SourceContentIndexer.buildIndex(for: indexedSource)
         #expect(index.displayItemCountsByKind[.world] == 1)
-        #expect(index.displayItemCountsByKind[.resourcePack] == 1)
+        #expect(index.displayItemCountsByKind[.resourcePack] == 2)
+        #expect(index.displayItemCountsByKind[.shaderPack] == 1)
+        #expect(index.displayItemCountsByKind[.mod] == 1)
 
         indexedSource.rawItems = enrichedItems
-        let snapshot = SourceScanPolicy.buildSnapshot(for: indexedSource, scanRootURL: rootURL)
+        let snapshot = SourceScanPolicy.buildSnapshot(for: indexedSource, scanRootURL: instanceURL)
         #expect(snapshot.collectionSnapshots.map(\.folderName).contains("saves"))
         #expect(snapshot.collectionSnapshots.map(\.folderName).contains("resourcepacks"))
+        #expect(snapshot.collectionSnapshots.map(\.folderName).contains("shaderpacks"))
+        #expect(snapshot.collectionSnapshots.map(\.folderName).contains("mods"))
+    }
+
+    @Test func javaArchiveEnrichmentReadsModMetadataPackMetadataAndIcons() async throws {
+        let fileManager = FileManager.default
+        let workingURL = fileManager.temporaryDirectory.appendingPathComponent(UUID().uuidString, isDirectory: true)
+        let modSourceURL = workingURL.appendingPathComponent("ModSource", isDirectory: true)
+        let resourceSourceURL = workingURL.appendingPathComponent("ResourceSource", isDirectory: true)
+        let modArchiveURL = workingURL.appendingPathComponent("ExampleMod.jar")
+        let resourceArchiveURL = workingURL.appendingPathComponent("ExamplePack.zip")
+        defer { try? fileManager.removeItem(at: workingURL) }
+
+        try fileManager.createDirectory(at: modSourceURL.appendingPathComponent("META-INF", isDirectory: true), withIntermediateDirectories: true)
+        try """
+        modLoader = "javafml"
+        loaderVersion = "[1,)"
+
+        [[mods]]
+        modId = "examplemod"
+        displayName = "Example Java Mod"
+        logoFile = "icon.png"
+        description = "A test mod."
+        """.write(
+            to: modSourceURL.appendingPathComponent("META-INF/neoforge.mods.toml"),
+            atomically: true,
+            encoding: .utf8
+        )
+        try """
+        {
+          "pack": {
+            "description": "Example Mod Resources",
+            "pack_format": 31
+          }
+        }
+        """.write(to: modSourceURL.appendingPathComponent("pack.mcmeta"), atomically: true, encoding: .utf8)
+        try Data([0x89, 0x50, 0x4E, 0x47]).write(to: modSourceURL.appendingPathComponent("icon.png"))
+        try makeArchive(from: modSourceURL, to: modArchiveURL)
+
+        try fileManager.createDirectory(at: resourceSourceURL, withIntermediateDirectories: true)
+        try """
+        {
+          "pack": {
+            "description": "Example Resource Pack",
+            "pack_format": 34
+          }
+        }
+        """.write(to: resourceSourceURL.appendingPathComponent("pack.mcmeta"), atomically: true, encoding: .utf8)
+        try Data([0x89, 0x50, 0x4E, 0x47]).write(to: resourceSourceURL.appendingPathComponent("pack.png"))
+        try makeArchive(from: resourceSourceURL, to: resourceArchiveURL)
+
+        let modItem = MinecraftContentItem(
+            folderURL: modArchiveURL,
+            folderName: modArchiveURL.lastPathComponent,
+            contentType: .resourcePack,
+            sourceEdition: .java,
+            contentKind: .mod,
+            platformType: .java(.mod),
+            collectionRootURL: workingURL,
+            capabilities: .java(contentType: .mod),
+            platformMetadata: .java(JavaContentMetadata())
+        )
+        let resourceItem = MinecraftContentItem(
+            folderURL: resourceArchiveURL,
+            folderName: resourceArchiveURL.lastPathComponent,
+            contentType: .resourcePack,
+            sourceEdition: .java,
+            contentKind: .resourcePack,
+            platformType: .java(.resourcePack),
+            collectionRootURL: workingURL,
+            capabilities: .java(contentType: .resourcePack),
+            platformMetadata: .java(JavaContentMetadata())
+        )
+
+        let enrichedMod = await JavaContentScanner.enrich(item: modItem)
+        let enrichedResource = await JavaContentScanner.enrich(item: resourceItem)
+
+        #expect(enrichedMod.displayName == "Example Java Mod")
+        #expect(enrichedMod.iconURL != nil)
+        #expect(enrichedMod.hasKnownIcon)
+        if case .java(let metadata) = enrichedMod.platformMetadata {
+            #expect(metadata.pack?.description == "Example Mod Resources")
+            #expect(metadata.pack?.packFormat == 31)
+        } else {
+            Issue.record("Expected Java metadata")
+        }
+
+        #expect(enrichedResource.iconURL != nil)
+        if case .java(let metadata) = enrichedResource.platformMetadata {
+            #expect(metadata.pack?.description == "Example Resource Pack")
+            #expect(metadata.pack?.packFormat == 34)
+        } else {
+            Issue.record("Expected Java metadata")
+        }
+    }
+
+    @Test func sourceLibraryAddSourceResolvesJavaWrapperFolder() async throws {
+        let fileManager = FileManager.default
+        let rootURL = fileManager.temporaryDirectory.appendingPathComponent(UUID().uuidString, isDirectory: true)
+        let instanceURL = rootURL.appendingPathComponent("Better MC [NEOFORGE] BMC5", isDirectory: true)
+        let modURL = instanceURL.appendingPathComponent("mods/ExampleMod.jar")
+        defer { try? fileManager.removeItem(at: rootURL) }
+
+        try fileManager.createDirectory(at: modURL.deletingLastPathComponent(), withIntermediateDirectories: true)
+        try Data("jar".utf8).write(to: modURL)
+        try fileManager.createDirectory(
+            at: instanceURL.appendingPathComponent("resourcepacks", isDirectory: true),
+            withIntermediateDirectories: true
+        )
+
+        let access = SourceAccessCoordinator(
+            accessMethods: [
+                LocalFolderSourceAccess(),
+                JavaLocalFolderSourceAccess()
+            ]
+        )
+        let library = SourceLibrary(sourceAccessMethod: access)
+
+        let sourceID = await library.addSource(at: rootURL)
+        guard let source = library.source(withID: sourceID) else {
+            Issue.record("Expected added source")
+            return
+        }
+
+        #expect(source.folderURL == instanceURL.standardizedFileURL)
+        #expect(source.origin.kind == .localFolder)
+        #expect(source.edition == .java)
+        #expect(source.providerID == JavaLocalFolderSourceAccess().accessorIdentifier)
+        #expect(source.accessDescriptor.accessorIdentifier == JavaLocalFolderSourceAccess().accessorIdentifier)
     }
 
     @Test func libraryExternalRepresentationUsesPortablePackageByDefault() async throws {
@@ -1120,6 +1275,106 @@ struct World_Manager_for_MinecraftTests {
         #expect(restored[0].lastScanDate == legacyRecord.lastScanDate)
     }
 
+    @Test func sourceRestorationPreservesJavaProviderResolvedLocalFolder() async throws {
+        let sourceURL = URL(fileURLWithPath: "/tmp/JavaInstance", isDirectory: true)
+        let accessDescriptor = SourceAccessDescriptor(
+            accessorIdentifier: JavaLocalFolderSourceAccess().accessorIdentifier,
+            kind: .localFolder,
+            refreshStrategy: .eagerFullScan
+        )
+        let record = PersistedSourceRecord(
+            sourceID: sourceURL,
+            folderURL: sourceURL,
+            origin: .localFolder(bookmarkData: nil),
+            accessDescriptor: accessDescriptor,
+            availability: .available,
+            bookmarkData: nil,
+            displayName: "Java Instance",
+            rawItems: [],
+            snapshot: nil,
+            lastScanDate: nil,
+            needsRepair: false
+        )
+
+        let source = SourceRestoration.restoredSource(from: record) { _, _ in "" }
+
+        #expect(source.origin.kind == .localFolder)
+        #expect(source.edition == .java)
+        #expect(source.providerID == JavaLocalFolderSourceAccess().accessorIdentifier)
+        #expect(source.accessDescriptor == accessDescriptor)
+    }
+
+    @Test func javaRestoredSnapshotDoesNotRequestRefreshWhenUnchanged() async throws {
+        let fileManager = FileManager.default
+        let sourceURL = fileManager.temporaryDirectory.appendingPathComponent(UUID().uuidString, isDirectory: true)
+        let modURL = sourceURL.appendingPathComponent("mods/ExampleMod.jar")
+        defer { try? fileManager.removeItem(at: sourceURL) }
+
+        try fileManager.createDirectory(at: modURL.deletingLastPathComponent(), withIntermediateDirectories: true)
+        try Data("jar".utf8).write(to: modURL)
+
+        let item = MinecraftContentItem(
+            folderURL: modURL,
+            folderName: modURL.lastPathComponent,
+            contentType: .resourcePack,
+            sourceEdition: .java,
+            contentKind: .mod,
+            platformType: .java(.mod),
+            collectionRootURL: modURL.deletingLastPathComponent(),
+            displayName: "ExampleMod",
+            capabilities: .java(contentType: .mod),
+            platformMetadata: .java(JavaContentMetadata())
+        )
+        var source = MinecraftSource(
+            folderURL: sourceURL,
+            origin: .localFolder(bookmarkData: nil),
+            accessDescriptor: SourceAccessDescriptor(
+                accessorIdentifier: JavaLocalFolderSourceAccess().accessorIdentifier,
+                kind: .localFolder,
+                refreshStrategy: .eagerFullScan
+            ),
+            availability: .available
+        )
+        source.providerID = JavaLocalFolderSourceAccess().accessorIdentifier
+        source.edition = .java
+        SourceRestoration.applyRestoredItemState(
+            [item],
+            lastScanDate: Date(timeIntervalSince1970: 1_000),
+            snapshot: nil,
+            to: &source
+        )
+        source.snapshot = SourceScanPolicy.buildSnapshot(for: source, scanRootURL: sourceURL)
+
+        let record = PersistedSourceRecord(
+            sourceID: source.id,
+            folderURL: source.folderURL,
+            origin: source.origin,
+            accessDescriptor: source.accessDescriptor,
+            availability: source.availability,
+            bookmarkData: nil,
+            displayName: source.displayName,
+            rawItems: source.rawItems,
+            snapshot: source.snapshot,
+            lastScanDate: source.lastScanDate,
+            needsRepair: false
+        )
+
+        let refreshReason = SourceRestoration.startupRefreshReason(
+            for: source,
+            persistedRecord: record
+        ) { url, edition in
+            switch edition {
+            case .bedrock:
+                return WorldScanner.collectionSnapshots(in: url)
+            case .java:
+                return JavaContentScanner.collectionSnapshots(in: url)
+            }
+        }
+
+        #expect(refreshReason == nil)
+        #expect(source.snapshot?.collectionSnapshots.first?.childDirectoryCount == 1)
+    }
+
     @Test func connectedDeviceSourceFactoryCreatesStableSyntheticIdentifier() async throws {
         let device = ConnectedDevice(
             udid: "00008110-001234560E90001E",

docs/provider-architecture-design.md

@@ -51,6 +51,36 @@ UI
 
 ## Core Concepts
 
+### Local Folder Intake
+
+The folder picker should not decide the platform. A picked folder is a local
+access root; providers decide whether it contains Bedrock, Java, or another
+platform.
+
+```text
+User picks folder
+  -> provider registry asks local providers to probe it
+  -> strongest probe chooses provider, edition, and source root
+  -> source is stored as a local folder with providerID/accessDescriptor
+  -> scans route through the selected provider
+```
+
+This keeps filesystem access separate from Minecraft format knowledge. For
+example, selecting a wrapper folder that contains one Java modpack instance can
+resolve to the nested instance folder while still using local folder access.
+
+```swift
+struct SourceProbeResult {
+    let providerID: PlatformProviderID
+    let edition: MinecraftEdition
+    let confidence: SourceProbeConfidence
+    let sourceRootURL: URL
+    let displayName: String
+    let detectedKinds: Set<MinecraftContentKind>
+    let warnings: [String]
+}
+```
+
 ### Provider
 
 A provider is the unit that knows a platform and access method. A provider can