Implement ReadDir() in Xbox FAT plugin.

DiscImageChef.Filesystems/FATX/Super.cs

@@ -32,6 +32,7 @@
 
 using System;
 using System.Collections.Generic;
+using System.Globalization;
 using System.Runtime.InteropServices;
 using System.Text;
 using DiscImageChef.CommonTypes;
@@ -207,6 +208,9 @@ namespace DiscImageChef.Filesystems.FATX
                 rootDirectory.Add(filename, entry);
             }
 
+            cultureInfo    = new CultureInfo("en-US", false);
+            directoryCache = new Dictionary<string, Dictionary<string, DirectoryEntry>>();
+
             return Errno.NoError;
         }