BUT: any single part of the model has to be under 64000 polygons. All together can be 150000 (yep, I have such) or much more, but an individual part must not pass the limit. Or it can simply be a bug with that particular model. Or can be a different problem. I've had models mapped in LithUnwrap get I/O error, while the same model imports fine unmapped. Possibly something with joining the polygons or whatever.

-- erlik