QUOTE(Mad_Eyes @ Jun 22 2007, 08:33 PM)

Hypothetically speaking, let's say they all came in a .7z format. Would all the extensions be changed to smc if u typed:
ren *.7z *.smc
Technically yes, but the games would not load in any emulator (Xbox or PC). If you did this you would just be changing the extension from 7z to zip. The problem is 7z is allready a compressed format. This thread is about taking "uncompressed" snes roms with no extension and adding one.
7z is a file compression format (like rar or zip). Download 7-zip and extract all the games. This will extract all the games and they will have smc, swc, etc... extensions. If after you extract them, they don't have any extensions, "only then" you would use this tutorial to add smc extensions. At this point you can load them in ZsnexBox or xSnes9x. But the better way would be to compress them in standard zip format. With winrar you can zip up all the games at once but put them in separate zip archives.
So:
1) Extract with 7-zip
2) Add extensions if you need to
3) Zip them all up individually with winrar
4) Run them through a fatx tool to make them Xbox compliant filenames
5) Load them in xSnes9x or ZsnexBox and play