I've found some QuickTime movie files in which the seek bar doesn't work properly in WMP. While the videos are initializing it has the correct video length, but once they begin to play WMP seems to think the videos are way longer than they actually are. Is this going to be fixed?

you can test some videos here - http://media.xbox360.ign.com/media/729/729509/vids_1.html

Of course they work fine with MPC, but I tend to prefer WMP whenever possible.