OK, I've literally tried everything... I'm using an old mame version (0.170), because of the graphic filter. Newer versions don't have it, I don't wanna update it because of that. I mean, it kinda does have "similar" graphic filters, but I don't wanna set it up every time I play a game. It's boring.
So I figured out the game was missing qsound.bin... If I place qsound.zip in the rom folder, it doesn't work. If I extract dl-1425.bin from qsound.zip and put it into one of the Capcom rom zip, it doesn't work. If I rename dl-1425.bin to qsound.bin and place it inside the rom.zip it works, but only on later versions of MAME (0.223, for example), but as I said, I need to run in on 0.170.
Is that even possible? Can someone help me?