I still have no idea what you guys are indicating with this "Save for a computer" thing. It said nothing like that when I made the movie. I told it to save, told it where I wanted it to be saved, and gave it a name.
As for the the file, it's a wlmp.
Never mind, I found what y'all were talking about! Now they're saved as wmv's. My converter program doesn't seem to want them to be avi's; I hope wmv's will be good enough for YouTube...
Thanks for the help, guys!