It's definitely not a Windows 7 problem, I've also been able to open my old DOS Quake CD without any problem. One thing I did notice was that the default action was registered as "Play" and that it required a right-click in explorer to select "Open". You've already tried that however, so maybe it's not relevant.
I suspect that you might have some 3rd party shell extension installed that is interfering with correct handling of mixed mode drives, possibly from CD writing software, a media player, or something similar. But it's not Windows 7 itself; that works.
I suspect that you might have some 3rd party shell extension installed that is interfering with correct handling of mixed mode drives, possibly from CD writing software, a media player, or something similar. But it's not Windows 7 itself; that works.
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