OBJ or any other format you're comfortable with. MDL files, so instead I'll link you to Noesis. I don't want to get into decompiling Source. When downloading GIMS, I recommend the full download. You'll also need Shadow's IV Plugin 0.3.0 and GIMS for 3DS Max, as well as a copy of the latest version of Open IV. It's not really free, but you can download a trial from the Autodesk website. You'll need a copy of Autodesk 3D Studio Max 9 or newer. I'll apologize for the 10 day reply, but I didn't see this thread until now.
