If nothing comes in something is wrong...maybe it doesn't recognize something in the format. If you don't see it listed in the tree something is not right.Obj usually works best and fixing the textures can be easier, but a pain too. That's usually an issue w/ reading the materials file. Make sure there is a path statement in the obj with no quotes. Also no quotes in mtl when referring to the material.

No need to think outside the box....
    Just make it invisible.