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Sure, the convenience of the CD is probably a selling point.

I seem to recall something about an 'off-line music player' on the CD version, but that might have been the Sega version. I also seem to recall the CD version being the fully patched version, with the updated Setup Utility and the speech fix. Perhaps the Dune II CD that came with the 'commemorative edition' of C'n'C was the only such version.

Maybe if someone with an actual Dune II CD could perchance verify, perhaps?