(re: Running older games on Windows XP)
Compatibility mode works in some cases, not all. For example, KQ5 will only launch if you’re in 640×480 resolution & 256 colors… you can set these using compatibility mode, but KQ5 still won’t run. You have to change the resolution manually before you can run the game (which can be done, but it’s not as obvious how to do it as it is in win98).
On the other hand, GK3 won’t work unless you set the installer to win98 or win95 compatibility… it thinks you’re using NT.