That's a proprietary Microsoft video format so other companies may not be allowed to save in that format. The rules changed over the years but try to save in the more common AVI or MPEG.
I could not save my Movie into my computer using The Windows Movie Maker in XP. It says "one or more of the original source files cannot be found".
I also try other software like Video Edit Magic 3 and had the same problem. Cannot save Movie in wmv or asf file. It says "source filter for this media file could not be loaded"
I'm stuck down here. I dont understand what is source filter & source files? Anybody can help me out with it? Thank you very much.