I had the same problem that dsawan have in my SAS 4.12. The log.lst showed this error : ERROR: Can't open file '3DO/Plane/HALIFAX-B-Mk3(Multi1)/Disc.mat. There was not a mat file Disc into the folder, only Disc1. So I made a copy of this file and renamed it as Disc. It worked, but we must have both files Disc and Disc1, I don't know how