I'm new to emulating Atari roms on my PC and I was wondering how exactly this is done. I followed the instructions in the help guide of the MESS emulator, which is supposedly the only working 7800 emulator out there and it said to put the system rom (I guess that would be 7800.rom) as well as the roms you want to play into a zip folder (which must have the same name as the system rom, which is 7800). So, I did that but nothing happened. I have a feeling that it may have something to do with the fact that the roms have a file extension of .A78 instead of .rom. What did I do wrong?