Gmax models and yobguls converter

Uh, I have a problem with yobguls file converter, i save my gmax model as a text file and everything but i cant get yobguls converter to save it as a .mdx file saying its an unrecognized file format. Can someone tell me what I'm doing wrong?

check your file extension. its supposed to be .mdl not .txt

I don't know how to change it from .txt to .mdl .

just rename the file. remove the "_mcr" from the end, and add ".mcr" (without the quotes)

Ok, I did that now but when I try to convert it says "Error (line 1): Unexpected token "� ½"

well that means your model is stuffed, and there is an 99% chance it cant be fixed unless you start again.

Ok, it's a .mdx file now but when I load it up in the Warcraft 3 File Viewer, I dont see it.