As you know, Windows will show a picture representation of a video file when you click on it (as long as you're not using list/details view etc). I'm currently working on a wmv file that, even if I take a clip from the middle of it, the thumbnail is the same as the original file i.e. the first frame. Never seen that before. Is this a 'tag' and, if so, is it removeable?

Thanks for any assistance offered.