changing mime association

["Minson, John M. [Contractor]" <minsonj spawar navy mil>]

Helix Code (up to date)

All my attempts to change the mime association of a <something>.mpeg file to
'gtv' fail.
The 'edit mime types' operation seems to work and shows 'gtv' in both the
open and view
fields of the Mime Type Actions . When I open a 'mpeg' it insists on running
'xanim' .
Is there some system wide default overriding my personnel settings ?

Jon