Huh? What does getting a model from Milkshape to 3D Studio Max have to do with anything? Plus, you can already do that via several file formats, including 3ds and obj.
As jfk said, get Ultimate Unwrap. It can import AND export b3d models, and can open/save ms3d (Milkshape file format.)
As jfk said, get Ultimate Unwrap. It can import AND export b3d models, and can open/save ms3d (Milkshape file format.)