After reading over my post, I realized that I wasn't quite clear. When I said WinRAR won't extract the .iso files, I mean that WinRAR won't take any of the files out of the iso. It will extract the .iso file out of the .rar file fine, and then you can burn the .iso file onto a cd with nero or primodvd or whatever you want. I'm not sure whether you're having problems getting that file to boot, or if you're trying to break that file up.
If you're trying to break the file up, use xISO or xboxisotool like I mentioned in my previous post.
However, if you're just trying to burn the .iso file to a cd and that's not booting, then you probably need to try different media. The file is really small, and the xbox dvd drive is really picky, so it's gonna be hard for the xbox to read the disc when you put it in.
Sorry I was unclear before. I just assumed you were trying to break apart the iso file. Forgive me if you were just trying to burn the file and it wasn't working, because then my previous message won't even apply to that.
Lots of people have trouble getting EvoX to run, and go through quite a few different types of media to get it working.