Changing File Types and Fil Associations in Citrix

Taken from Microsoft article 256986. On computers running Windows 2000 Terminal Services in Application Server mode, the UI may be locked down so that no one can change file type associations (not even administrators). This is done so that you can only edit the entries programmatically or by using MSI-based applications. This ensures that an inadvertent change in the UI does not effect the global file type associations across the computer running Terminal Services and all of its users. When this policy is enabled, the New,Delete, Change, and Advanced buttons are unavailable on the File Types tab of the Folder Options tool in Control Panel. You can enable this functionality by changing the following registry entry: [HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Policies\\Explorer] "NoFileAssociate"=dword:00000000 Changing this key from its default value of 00000001 enables the File Types dialog box to function just as it does for other Windows 2000 configurations. Administrators and Power Users can change the global file type settings for the computer and all of its users.