The DSON core installer is used by Daz Studio. All files for DS4 and up with have a DSON core installer. Unless the product mentions Poser Companion files or Poser Core Installer, then it won't open in Poser without the use of D3D's DSON loader (or making your own PCF's) -- exactly as hborre says.

I don't have the Mars Habitat, but I did buy Streets of London. I didn't use the DSON loader to get it into Poser because I wanted native Poser props. Instead, I exported the entire scene from DS (as FBX) and then imported into Poser. This way, all the props were correctly sized and in the right places, and all the textures were properly attached..

It worked, but not perfectly. A couple of roofs had some bad polys, which I fixed by spawning a prop of just the roof and then subdividing it. And, of course, none of the shaders survived. However, I very much wanted the props, and I'm totally happy with my purchase and with the conversion into Poser.

Whether it will work with other products, or will work as well as you need it to, I can't say. But aside from a couple of very minor errors with some polys and the total loss of all shaders, Stonemason's props seem to import into Poser quite well. Rigged figures, however, may not. Your mileage may vary. If you don't have a tolerance for some errors, or are not willing to fix them yourself, I wouldn't recommend this method.

I didn't even try using D3D's script.... Hmmm. Perhaps it would have been better to use it to get the props into Poser, and then spawn props from within Poser, in order to get PP2's.

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PoserPro 2014, PS CS5.5 Ext, Nikon D300. Win 8, i7-4770 @ 3.4 GHz, AMD Radeon 8570, 12 GB RAM.