fastfat fails to move file to the root directory

MoveFile("C:\\Documents and Settings\\Administrator\\My Documents\\winetest\\winetest", "C:\\winetest");

        else if (TargetFileObject != NULL)

        {

            /* Here, copy first path name and then append filename */

            RtlCopyUnicodeString(&NewName, &((PVFATFCB)TargetFileObject->FsContext)->PathNameU);

            NewName.Buffer[NewName.Length / sizeof(WCHAR)] = L'\\';

            NewName.Length += sizeof(WCHAR);

            RtlAppendUnicodeStringToString(&NewName, &RenameInfoString);

        }