Any one can teach me.
I setup system.cfg like as below.
artwork snap e:\Emulator\Attract Mode\emu\Sammy Atomiswave\videos
artwork snap e:\Emulator\Attract Mode\emu\Sammy Atomiswave\snap
When the script write as snap_t = fe.add_artwork( "snap", 0, 0, 320, 240 );, then AM will prefer to play video.
My question is: Any way to let AM to load snap image, if no image finding, then playing video.