[ADFS] Replace '/' for '.'.

Aaru.Filesystems/Acorn/Dir.cs

@@ -84,6 +84,10 @@ public sealed partial class AcornADFS
         {
             string component = pathComponents[p];
 
+            // ADFS uses '.' as path separator, so '.' in the user path must be converted to '/'
+            // for internal name matching (on-disk names use '/' where '.' would appear)
+            component = component.Replace('.', '/');
+
             // Find the component in current directory
             if(!currentEntries.TryGetValue(component, out DirectoryEntryInfo entry)) return ErrorNumber.NoSuchFile;
 
@@ -146,6 +150,10 @@ public sealed partial class AcornADFS
         // Get current filename and advance position
         filename = acornNode.EntryNames[acornNode.Position++];
 
+        // In ADFS, the dot (.) is the path separator, not the forward slash (/)
+        // Convert forward slashes in filenames to dots for proper RISC OS representation
+        filename = filename.Replace('/', '.');
+
         return ErrorNumber.NoError;
     }
 

Aaru.Filesystems/Acorn/File.cs

@@ -636,6 +636,10 @@ public sealed partial class AcornADFS
         {
             string component = pathComponents[p];
 
+            // ADFS uses '.' as path separator, so '.' in the user path must be converted to '/'
+            // for internal name matching (on-disk names use '/' where '.' would appear)
+            component = component.Replace('.', '/');
+
             // Find the component in current directory
             if(!currentEntries.TryGetValue(component, out DirectoryEntryInfo foundEntry)) return ErrorNumber.NoSuchFile;