Changing File Associations in Server 2003

I have two problems relating to file associations. I cannot change the file association for those users who are not administrators. Adding the registry key per a microsoft article does not work. Help!

The other issue is with Microsoft Picture and Fax viewer. This piece of junk does not work for me. The printing totally screws up applications that print drawings as part of job paperwork. I need to use another program to view and print jpegs, any suggestions?