I have this python script sitting in my runtime... I don't remember where I got it from or who it was by (a freebie obviously, and for some reason no ReadMe that I can recall... Or a ReadMe of such insignificance that I didn't save it).

Anyway it's supposed to render a thumb for Pz3's somehow but I've never gotten it to work. The error message seems to indicate it's because I'm using a Mac?

Anyway here's the script, maybe you'll have better luck if you want to fiddle with it...