It's probably nothing to do with your problem, but might be worth a try...
Before Windows 95, PC operating systems used a short filename standard, with 8 capital letters or numbers for the filename, and 3 capital letters or numbers for the filename extension.
http://en.wikipedia.org/wiki/8.3_filenameSo, a filename might look like this...
SAMPLE01.SND
or
PROGRAM1.PGM
I have no idea what sort of filenames are allowed on an Akai format CDROMs, but it wouldn't hurt to test it with only short 8.3 filenames.
The MPC3000 disk format allows up to 16 character filenames, with a 3 letter extension, the S1000/3000 allows up to 12 character filenames.