Compressed Filetypes: .rar- Windows: WinRAR Mac: UnRarX .7z- Windows: 7-zip Mac: 7zX .001/.002/etc. .part1/.part2/etc.- Same as a rar file Windows: WinRAR Mac: UnRarX ROM Filetypes: .img/.bin/.iso- Should work just fine with PSX4iPhone .Z- Use this with PSX4iPhone, it's just a compressed ROM and should run fine. .ZNX- As of version .01, this will not run with PSX4iPhone. It is promised to work soon. It is a ROM with videos/audio taken out to make it much smaller. I hope this helps some of you guys.