*"How do those pngs get generated? 
*One of 2 ways - automatically when you save a model back to the figure or poses library. 
Or you make one yourself, .PNG's in Poser are usually 91x91 pixels square.   

Some vendors will make custom images - some vendors just save straight back. 

*"Sure, I could just load all 96 objects individually, resave"
*Or you could ask the vendor to help you. Most folks are pretty approachable.

Pinky - you left the lens cap of your mind on again.