Mark Kinkead bought the licenses for the classic early PC strategy games Perfect General and Empire. He has converted them to modern code to run on Windows and be playable over the internet. Demos are available for free download and new enhanced internet editions are available for purchase.
If you look around the internet you might find free old versions of the games before his conversion and they should run on your machine. I have a Perfect General 2 that does after I downloaded and burned a CD for it. I also just found a very old style Empire conversion on a Russian site, not nearly as good as Kinkaid's new versions but free. This was developed in 2001 by Jimmy Maher in Texas.