There are two "Eureka" games in the file, both by Ian Livingstone. In one, you wander about a dinosaur infested landscape, attempting to avoid getting eaten. In the other, you attempt to escape from a POW camp in Germany. Both come complete with C64 pixilated graphics and cheezy music, which will make you giggle. The fun ends there, though, since you need to wait for the pictures to render every time you move (only about 1 second, but enough to get annoying as you attempt to move about quickly) and the music will make you hit the mute button after about 40 seconds.
Neither Eureka game contains anything worth working through. The descriptions are sparse, the parser is limited, and the map is large and bare. The dinosaur game ends abruptly in instant death in several places.
For those who are technologically challenged like myself, I found a C64 emulator at http://www.ccs64.com/ I can't vouch for it being virus-free or safe to download, but it did run the games.