As AlphaUMi stated, MAME artwork is configured within MAME rather than GameEx. Typically the MAME artwork should go into an ‘artwork’ sub-directory located in the same directory as your MAME executable. If you access the MAME settings menu (typically using the tab key), all available artwork configurations are located under the ‘Video Options’ menu. There you will find any available alternate bezels, overlays, etc. available for the game that’s currently loaded. I’m away from my emulation rig, so I’m kind of working from memory here. There’s a fantastic MAME Artwork FAQ over at Mr. Dos Arcade naturally (although that particular site is blocked on the machine I’m using, so hopefully the link works). Give that FAQ a read and it should put you on the right track. I haven’t figured out if there’s a way to use the GameEx bezel settings in combination with MAME artwork though. In other words it would be cool if GameEx could determine whether a bezel was already being applied by MAME, and if so use the MAME artwork, otherwise apply the GameEx bezel. If anyone is already doing that, I’d love to hear how they pulled it off.