preferred app question

["Jack Ostroff \(CT D8 TC\)" <ostroffjh sbcglobal net>]

I'm sure I should be able to figure this out, but maybe I just haven't  
had enough sleep.

I just received an email, with an attached wmv file.  Looking at the  
message parts, it shows as Windows Media video, which seems good.   
However, selecting it only offers "Open part with gmplayer" or "Save  
part."  The problem is that I have not had gmplayer installed in ages.   
If I go back to the list of parts and right click on it, I get a list  
of three possible players to use (as well as save) which does include  
my preferred player.  If I run gnome-default-applications-properties,  
either directly or through gnome-control-center (I'm on a mainly KDE  
system) the default media player is Totem movie player (which is  
installed) but even if I change that to my preferred app (vlc) I still  
only get gmplayer offered.

Where should I configure this stuff?

Thanks for any hints or suggestions.

Jack