Bee to the rescue!
First off, screw those fuckers selling it for five bucks. You can download Softdisk G-S #17 for free here:
http://www.apple-iigs.info/software/softdiskgs.htm
(You can download the other volumes there too, by the way.)
Second, this isn't software for Apple II, but rather for Apple IIGS, and thus it won't run on AppleWin or other Apple II emulators. For the GS, I recommend the
KEGS32 emulator.
Finally, it runs perfectly -- I've just tested it; here are some screenies:
Here's the disk mounted with KEGS32 (F4 to access the disk mount menu, just FYI.)
Then open the "DD3" folder:
Then run "dark3.gs.system".
Ooh shiny! By John Carmack!
Starting off in a garbade dump! Old school!
Happy New Year! :p
P.S. Thanks for letting me know about the game, by the way. I didn't even know it existed, and I thought I knew every Apple IIGS RPG in existence. (Which was silly of me, of course, since there must be lots of RPGs released on disks like those that no one knows about.)
P.P.S. And no, there is no DOS version from the looks of it.