Based on the search term "fbneo romset unknown", you are likely encountering an issue where your emulator (such as RetroArch, FBNeo, or FightCade) is not recognizing your game files, or you are trying to figure out which version of games you possess.
Version Mismatch: Your ROMs may be from an older or different set (like an old MAME set) that doesn't match the current FBNeo core version. fbneo romset unknown
Some older games (like Donkey Kong or Galaga) use "Samples" for sound. If the emulator sees the ROM but doesn't see the matching sound samples, it may flag the set as incomplete or unknown. The Arcade vs. Console Rule Based on the search term "fbneo romset unknown"
FBNeo supports consoles (Mega Drive, NES, ColecoVision). Ensure your console ROMs aren't zipped if the emulator expects a specific extension like .md or .nes, though for arcade games, always keep them zipped. If the emulator sees the ROM but doesn't
If you have a mixed collection and want to convert MAME ROMs to FBNeo, use a tool called ClrMAMEPro or ROMVault.
Each ZIP file contains every file needed to run that specific game, including the BIOS. This is the easiest way to avoid "unknown" or "missing file" errors.