Hi
Then your best bet is probably to use the * symbol and search for file types.
I.e. run a search for *.mpg, *.avi, *.wmv etc.
I never noticed that Windows XP would let you search just for video files,
Why Windows 7 doesn't work the same is another Microsoft Mystery.
But XP had a very good search app, and Windows 7 doesn't and I'm not sure it's any better after Service Pack 1.
Mike