Oh, so that’s why Epic’s Easy anticheat keeps having trouble. Microsoft might be using it as a trial run.

In no particular order: Age of empires, HoMMs, Disciples, StarCraft, WarCraft, Dark Reign, Battlezone, Red Alert, Dune, Lula, 3D maze screensaver, strip poker, Duke Nukem, a virused version of that desktop mayhem thing that let you smash it in all kinds of way and many others that will be mentioned in other comments.

Games that give you a lifetime of fun.