RatDVD?

I have a .ratdvd file. I downloaded ratdvd, but I can’t figure out how to use it.
All I want is a good old avi. I don’t care about extra features, languages or whatever. There are options to convert the .ratdvd file to dvd, but I’m not too keen on the idea of having to first convert to dvd, then compress to avi. Is there a way to do this directly?