I use 3DWin4 a lot, it's great for converting, as well as scaling, translating, and rotating. My only gripe with it is that it insists on adding "vn" statements for the normals to your OBJ file, which makes it about twice as large, and aren't used when importing to Poser anyway. Be sure to un-check "Export normals" when you save it out of UV Mapper, and you'll be fine.