Adding myself and fixing Windows Tests.

core/src/main/java/art/arcane/iris/core/datapack/DatapackIngestService.java

@@ -2152,7 +2152,12 @@ public final class DatapackIngestService {
         if (fileKey != null) {
             return "key:" + fileKey;
         }
-        return "";
+        // Windows exposes no inode-equivalent for a directory, and returning nothing here fails
+        // the identity gate closed, which disables legacy staging replacement on that platform
+        // outright. Creation time is the one stable discriminator the filesystem still offers: a
+        // directory swapped in at the same path brings its own, so a swap is still caught. It is
+        // a weaker guarantee than an inode, so it is only ever the fallback.
+        return "created:" + attributes.creationTime();
     }
 
     private static boolean pathExists(Path path, String purpose) throws IOException {

core/src/main/java/art/arcane/iris/core/service/JigsawStudioHistoryStore.java

@@ -374,6 +374,12 @@ final class JigsawStudioHistoryStore {
     }
 
     private static void forceDirectory(Path directory) throws IOException {
+        // A directory can only be opened and fsynced on a POSIX filesystem; Windows rejects the
+        // open outright. Matches DirectoryDurability and DatapackIngestService, which already
+        // skip the barrier there.
+        if (!Files.getFileStore(directory).supportsFileAttributeView("posix")) {
+            return;
+        }
         try (FileChannel channel = FileChannel.open(directory, StandardOpenOption.READ)) {
             channel.force(true);
         }