IIRC, they are in 3dmf format which the then 3D Exploration could read pretty well. There may be some freeware cpnverters that will read them also. Didn't know about their objections to using other applications - 'course they better out that in their EULA. Even the few "detailed" models they have don't look that earthshaking to me. They're OK especially for scene fillers but unless it's something specific they have, you can find as good or better free buildings on the 'net in more Poser friendly formats.

"Democracy is a pathetic belief in the collective wisdom of individual ignorance." - H. L. Mencken