Game iso format. Need GNU/Linux support.

Using genisoimage to create a game.iso, game.iso won’t mount with WebMan. Using Hermes makeps3iso.exe under windows, the game mounts. How exactly can I create valid images that will mount with WebMan under Linux, particularly Debian 8? According to the program ‘file’, the working image is a plain CD-ROM file.

P.S. I can’t find the source for _ANY_ of the iso creators for Windows to port or learn from. I did look at the diffs in the images, but that was a little more than expected :-(.