you can use this importer to bring wow models into 3ds max...so they say... then use an exporting script from max to convert to mdx/mdl. Dont ask me how to do all of this im not fammiliar with this tool...never did get into wow.
Once again, this is not an MDL or model editing question. This is about porting stuff. Why does everybody keep posting the wrong stuff in my forum?! Argh!