I finally upgraded our iMac to Mac OS X v10.5 and discovered that Myst III Exile does not recognize the DVD that shipped with Myst IV Revelation. When I try to play the game, it keeps asking for the disc even though it is obviously present.
This problem was discussed in another thread with no solution: http://discussions.apple.com/thread.jspa?messageID=5726031
I examined the 'Myst III Exile for Mac OS X' program with Hex Fiend ( http://ridiculousfish.com/hexfiend/) and found numerous references to 'data' and 'M3data' folders whereas these folders are actually named 'Data' and 'M3Data' on the disc. It seems that Leopard may be particular about case sensitivity for files on UDF discs and this was not so for Tiger.
Whatever the actual cause of the problem, Myst III Exile no longer complains about the missing disc after changing these references to the proper case using Hex Fiend.
If you'd rather not go hacking your own copy of the Myst III Exile program, you may wish to try this patch file I've just uploaded: http://homepage.mac.com/brianwells/.Public/Myst3_Leopard.patch
After downloading the patch, open the Terminal and use a command similar to the following to apply the patch:
bspatch /Volumes/Exile DVD/Myst III English/Myst III Exile for Mac OS X /Applications/Myst III/Myst III Exile for Mac OS X ~/Downloads/Myst3_Leopard.patch
The command shown here assumes you still have the patch in your Downloads folder and installed Myst III Exile in a 'Myst III' folder inside the Applications folder. It read a fresh copy of the program off the Myst III Exile DVD and writes the patched version to your hard drive.
Of course, the usual disclaimers apply: No warranty is provided for the patch and I am not responsible for any damage it cases - real or imagined.
Enjoy. 🙂