: Some versions of the game require separate decryption key files (like avsp.key ) to be present in the ROM folder for the main set to boot.
The error "avp.14m - incorrect length" specifically refers to a file size mismatch within the Alien vs. Predator (1994) avp14m incorrect length
This issue arises because MAME's requirements for ROM sets evolve to improve emulation accuracy. The "incorrect length" message means the avp.14m file in your current .zip archive is either a "bad dump" or is from an outdated romset that does not match the specifications of your current MAME version. Troubleshooting Guide 1. Match Romset to MAME Version : Some versions of the game require separate
Are you getting an "incorrect length" error when trying to boot Alien vs. Predator avp14m incorrect length