>>Just curious. If you go to Windows Explorer and look at Options.., File Types, do you still have MS-DOS application and MS-DOS batch listed? If not I suspect something with registry corruption.
>
>No, it's not. That might explain the problem. Any idea of how I can fix that? Thanks.

Check your registry to see if you have entries for these keys:

HKEY_CLASSES_ROOT\comfile
HKEY_CLASSES_ROOT\batfile
HKEY_CLASSES_ROOT\piffile

These are the only keys I found. Each has a few entries. It may require manual entry. Icannot find any setup information or Resource Kit information on this. Once you tell me if you have any/all of these, maybe I can help explain the difference I see here.

Randy