Ok, I use Magic Engine but have and older version than yours... but let's try arguing with general knowlege of the emulator. First, it doesn't matter how your cd bios image is named... just check for the Magic Engine ini file if it points to the right directory (which should be the same directory of pce.exe). Secondly, modify your command line accordingly to match that name, or, reversely, rename the file to match your command line... In the end, check that the file, the entry in the pce ini, and the command line in GameEx are all coherent...