Check if this helps:
257592 - Changes in File Types and File Association Features in
Windows 2000 and Windows Server 2003
http://support.microsoft.com/?kbid=257592
--
Vera Noest
MCSE, CCEA, Microsoft MVP - Terminal Server
http://hem.fyristorg.com/vera/IT
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> Change the Default Action for a File Type in Windows 2000
> with service terminal server is running