^^^^ What DeeceyArt said~

You can export from DS in OBJ and FBX formats. I don't know about other file formats, but those are the ones Poser readily imports into the program. I'm sorry you're having such trouble with this but I think if you export the DS file in OBJ or FBX format, you'll come out ahead. 

Found this YouTube tutorial; I hope you find it helpful! Converting DS files to Poser Format