What I meant was, that UVMapper will expect the OBJ file to be in the same format as yours was. There are, quite possibly, an infinite number of OBJ files which will result in the same apparent mesh object... If the texture coordinate list, or the facet list, is ordered differently, I suspect that a UVS file will no longer work. In that case, you couldn't just say "download such-and-such 3DS file, convert it to OBJ, and then apply my UVSes" because the conversion to OBJ isn't under your control.

But saying "use Crossroads to convert 3DS to OBJ" should be fine. :) Thanks for the Crossroads link - my old one had gone dead, and I couldn't find a new one at the time.