Yeah, actually he was a CAD/CAM guy, who received a file from someone else, and couldnt grasp that an "OpenNURBS" file could contain anything that wouldnt be read into his NURBS based Cad/CAM program (3dm is 3dm, right!)....Convinced it was a bug and proclaimed the software programmers were stupid idiots! :o

Can you imagine?? "Michael doesnt know what he is doing because MoI wont open this 3dm file, that is HIS filetype!!"

Anyway, an example of the confusion you were pointing out..