Maybe I am just missing something, but some games just don't work right. Example:

I download "aof.zip" Art of fighting, place it in the ROM folder, and the game does not show up in MAME (0.136).
I downlaod the game from 2 diffrent sights, nothing. And there is no other/multiple files for this game, just one.
Most of the games I get work just fine.

What am I doing wrong? 😅