File Association of Domain User
 

I have a domain user with an incorrect file association on XP Pro. Some
sort of group policy is restricting the change of file associations.
However the problem is not with the server 2003 group policy. When this
user logs into another computer,
the file association is correct. I have added this user to the
administrator's group at the server, but still no change button. How
can I change this file association?