I downloaded some props from this website but I am having trouble using them. I don't know how to open them with poser. The only ones that open have a .pz3 extension. Everything else that I downloaded doesn't seem to have that extension and it does not open.

I am looking to find some furniture (such as beds, couches, tables, etc). So far, I have not found anything decent that works. The poser library has some of it's own furniture but I didn't find anything good in there.