OK, I'll show ignorance? Not familiar with WM2 for video, only for Linux, and so I know I've got that wrong. I can tell you it's not a supported format, only by omission. If it's a wm2, it wouldn't be an avi so far as I know. If it's a strange codec that doesn't live on your machine, Vegas wouldn't be able to read it, either. Where did it originate?