Most all if not all of the commercial figures that you can get for Poser are "Unimesh" objects.  It is only after you import the object turn it into a figure does it get split.  And that includes everyone's favorite V4.  So since Poser works with V4 ther is no reason to think the Poser 13 won;t either.

Poser 5, 6, 7, 8, Poser Pro 9 (2012), 10 (2014), 11, 12, 13