Attached Link: http://www.okino.com/conv/imp_iges.htm

Ah... the ones I recognize are all CAD formats and the only CAD format Poser read is DXF. PolyTrans converts .iges (Initial Graphics Exchange Specification) but you have to buy Polytrans and the additional .iges plug-in (link above). You might try searching for some of the CAD forums on-line and see if there isn't some sort of freeware that will convert to DFX. Also, I've read that the Rhino modeler now reads .step and if you're desperate you might get someone here at the Rhino Forum to do the translation. HTH - Dan