Wow I had forgotten about this page entirely. The launcher is a Java program--you're not supposed to extract it, but run the file as-is in Java. However, I haven't updated the game in years, and I don't know which version exactly is available here but I wouldn't recommend downloading it.
I am currently working on rewriting the game from scratch, but I'm still a long way from being able to release something playable. So, sorry to disappoint you, but at the same time you're not missing an awful lot.