Attached Link: http://www.awakemm.com/poserarcana/

There is an understanding Poser files tutorial at Poser Arcana that explains the file types and locations that are specific to Poser. It won't explain the difference between a .max and a .3ds file, but I haven't really figured that out either. There may be a source for similar info here on 'rosity. Search in the tutorials section. Hope this helps GrayMare