I know you can do it with Adobe Premiere. I just tried it then, it lets you convert each frame of a movie into seperate bitmaps quite easilly.
Although it does not appear to work with wmv compressed files, it works fine with avi's, mpg's, divx etc (i tested it on a few).
EDIT: Okay, i got it - a way to do it for .wmv files: Open the file in Vegas (which has no problem with wmv's) then render the vid as something else (eg. an avi file), then open that file with Premeire and it will work, i just tested it. It may lose a bit of quality, i am not sure (the test vid i used was bad quality to begin with
). I assume there is probably an easier way to do this, that someone else will mention, if not, then i can give you more details