file is a specific ROM file for the arcade game Alien vs. Predator
If your file is a "bad dump" or from an older ROM set, it might be 0 bytes, truncated, or contain "overdumped" (duplicated) data, causing the emulator to reject it. 2. Why It Happens The Encryption Key Shift: Modern versions of MAME for CPS2 games (like ) now require specific files (e.g.,
