trying to run metal slug i get "Unknow or unsupported romset".
started it with the following:
/home/user/gngeo/bin/gngeo --biospath=/home/user/MyDocs/Roms/Neogeo/bios --fullscreen --rompath=/home/user/MyDocs/Roms/Neogeo --romrc=/home/user/gngeo/share/gngeo/romrc --romrcdir=/home/user/gngeo/share/gngeo/romrc.d --sound mslug

tried also with mslug2 and got the same.
the roms there are in zip - is this ok?