Most static models will work in GameGuru out of the box although its best to update the old "fpi" files to the latest "fpe" and there is a great tool here for converting these
https://forum.game-guru.com/thread/211068
Weapons can be converted but require more work and you will find plenty of info if you do a search on the forums ...
Characters are also possible but require a lot of converting... Most use " Animer " for this process
Hope that helps
The only person ever to get all his work done by "Friday" was Robinson Crusoe..