Oh. Of course. I've even used it a kajillion times. *sigh*

Anyhoo...

I did a save-to-obj for the object both when it was reflective and when it wasn't. The only difference between the matt .mtl and the reflective .mtl is the Ns value.

Reflective:
===================
newmtl brown
illum 2
Ka 0.2 0.2 0.2
Kd 0.533 0.4 0.267
Ks 0.0 0.0 0.0
Ns 128.0
===================

NON-reflective:
===================
newmtl brown
illum 2
Ka 0.2 0.2 0.2
Kd 0.533 0.4 0.267
Ks 0.0 0.0 0.0
Ns 1.0
===================