Import Scripts for Risen 2: Dark Waters

I’m interested in porting some models from Risen 2: Dark Waters. The models are in XMSH format. I can’t find much info, as not too many people seem to have tried decompiling Risen 2 models, but I’m hoping someone on the forums can come up with something useful. I found some mod tools on this page, but I can’t get the import script to work for gmax.
So, in short, does anyone know how to decompile XMSH models?