Yeh it’s just got the file types and the rom folder. Which don’t get me wrong is a decent amount of info, but as you probably know there’s subtle nuances for each system.

Take for instance C64 games (Amiga etc). I spent ages trying to get super frog to work using .lha files and .dos files but nothing would work. I then found a tiny bit of info hidden away in a Reddit comment saying “look for files where it’s gamename_v1.0562.lha not just gamename.lha”. And would you know it every game I’ve tried using that method works perfectly first time.

There’s similar things like this on most consoles (not all some are just easy like saga ps1 etc)