Quote Originally Posted by jonze View Post
For some reason it doesn't work with .wmv movies. Mpegs and AVI files are fine but when I try to open the joined .wmv it tells me it can't open it because it's not a movie file. Any advice? Anyone

Some .WMV files are just encoded differenty (I like to say "badly", but I don't want to sound too judgemental). I have the same issue. When this happens, I play the movie with VLC instead and it works. Unfortunately that means no editing, but at least you can see the clip.