Yeah, I'm fairly sure it's format is correct, as all the categories in the .ini is shown in GameEx, only the multiplayer categories are empty. [2 Player] 1941 1941j 1943 ... [3 Player] 3stooges armwar armwara ... [4 Player] aafb aafbb aafbc ... etc. If I import it in Mame32, it shows up fine. That's what baffled me. Anyway, thanks for the suggestions. I don't think I'll look into it further though, because all my spare time at the moment is going into starting a company. So as long as our favorite games are playable on the mame cab, I don't think I'll have the time or the energy to fiddle with config's. I do still keep visiting this forum, and I'm amazed by all the activity at the moment, and the level of helpfulness. And I'm curious as to which features are on the way, in future releases.