: This is the most frequent culprit. You cannot rename arcade ROMs (e.g., changing sfiii.zip to Street Fighter III.zip ) because the emulator uses the specific filename to configure itself.
The biggest mistake casual users make is assuming MAME ROMs work in FBNeo. They often do, but not always. FBNeo has forked its own path. romset is unknown fbneo fixed
(clrmamepro / RomVault / ARCME)