the mtl says:

#Produced by Art of Illusion 3.0, Wed May 21 16:44:58 EDT 2014
newmtl Default_Texture
Kd 0.23 0.23 0.23
Ks 0 0 0
Ka 0 0 0
illum 1

Still no joy.
Hopefully I will be able to attach a screenshot: