: As of yesterday, I am now the proud owner of a Macintosh OSX. The first two
: things I got for it are Pathways into Darkness and all three Marathon
: games on Aleph One.
: However, I do not know how to get the OSX versions to run: they are disk
: images and not the games themselves like my Windows copies. Are they just
: compressed files and not actual ROM images? How do I extract them on Mac?
Just double-click them. They're sort of compressed files, but instead of dumping direct to your hard drive or whatever, something akin to a CD/external disk shows up instead with the file(s) on it. In this particular case, you can probably just drag-and-drop the files from there to your hard drive.
On a bit of a tangent: is this an Intel machine or a PowerPC? This makes a great deal of difference in what older games you will be able to play.