Actually, when I go rom gathering for the new version files they are usually in regular .zip format.
For this backup archive though, I have ClrMAMEPro set to automatically rezip them all into .7z whenever I update. I converted en masse when MAME added the .7z ability all those years ago.(It was a much smaller set back then!) And then when I update my other ones from the main archive, they read the .7z and just make them into .zips there. Just the way I set it up way back then and left it alone since. Still works, why change it? EZPZ that way...
Pessimist: Oh, this can't get any worse!
Optimist: Yes, it can!
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