This happens with both 6.2 and 7.0, but I can't seem to select both. I always select individual packages to install and don't have a log handy of either install. The problem is that I can't change the Open/View action for the video/mpeg mime type. I first try using Gnome Control Center. The default is xanim, but I don't like that, I change it to use mtvp (MpegTV). In the dialog, whatever I type in is remembered. I then go to a gmc window and double-click an mpeg file, depending on whether xanim is installed, the file is eithered opened with xanim or I'm given an error the xanim can't be started. I have tracked it down to (I think) /usr/share/mime-info/mc.keys, which sets the mim-type video/* to use xanim. Changing these lines in any way doesn't seem to remove that mime-type association, however, instead it just breaks it. I've tried commenting them out and gievn open/view settings for each individual video/<type> mime-type, but they don't take. This is the only file I can find that is setting this association. I hope I've been as specific as you will need, but don't hesitate to request more information should you need it. I can be reached at jgeorgeson. Thanks.
Maybe jrb has ideas....
we are deprecating gmc in favor of nautilus, given that this bug is not critical.