GEX FILE EXTENSIONS

I was looking around for a tutorial in something I was going to try for a friend (he uses gamemaker7) and I just found it a few days ago. However, it is in a strange file format, GEX. I have searched all over and I cannot find out how to read the dang thing. Do any of you know how to read GEX files, or at least how to convert it into something readable?

Yes thank you! I searched all over that site but couldn't find it...
Thanks again.