The basic DSON Importer will if there are PoserCFs (Poser library files to launch the importer, and hopefully apply Poser material settings). If there are no PoserCFs it may still be possible to import, using Dimension3D's script to launch the importer with a file browser http://d3d.sesseler.de/index.php?software=poserpython&product=dson_loader but materials would then have to be redone (and some items just won't work in Poser).