I've got a Windows XP computer laying around at work, and after hours I sometimes fire up some of the classic DOS games like Tyrian 2000 and OMF 2097. I also dug up my copy of Cyberwar (the sequel to Lawnmower Man the PC game, released years before Jobe's War) which I might try out later. I was happy just to be able to rip the audio tracks from the Soundtrack CD.
Epic Megagames made some of the best PC-DOS games before Unreal, and Apogee/3D-Realms had a lot of classics. I've got quite a few of their shareware games installed. I also kept Zork Zero installed, because that's the only game in the Zork Anthology I can't play in my Linux environment.
"They'll never do it in time!"
"The code! The code! Figure out the code!"
"It won't be easy!"
"Cut this out second, this fourth, this first, this third."