As Caleb incorrectly posted, MPEG-1 playback is and has been built-in to Quicktime for many versions.
Eh, I got it halfway right, at least. I've never had reason to work with MPEG-1, so I was playing the guessing game there. The MPEG-4 stuff is all correct, though.
Amber, I'd try opening them with Windows Media Player, if you've got it. It's a miserable piece of horribly buggy code, but it does work, some of the time. As Phil said, VLC usually does a pretty decent job, or it has on my Linux box with plenty of horsepower and disk space..
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