when I check properties it say "poser executable files".
the way I saved them was, for example I pulled up V4 and then superimposed one of the figures I purchased off Renderosity. I would try mats from other figures or morphs to create something a little different. I would then save the result in a newly created file I had added to the library in the character section. I had the option to save under pose, lights, prop etc.

when I try to do file open in those folders nothing appears in the field unless I select "all files"
then all of the character files in the folder appear. I cannot open them.

I may try to load the same figures from Poser 6 again in Poser 8 and see if it works that way.
maybe it won't work unless I have the stuff I used initially to create it.