It can also be done with Resedit and Photoshop. I'm a bit rusty on the procedure as I'm using Poser 5 nowadays. Make your thumbnail pic in anyway you please and resize to 91 x 91 pixels. With the pic open in Photoshop do "select all, copy" so you have the pic on the clipboard. Open the pz2-file with Resedit. You'll get a little window with a square that has the word PICT under it. Choose Edit:Clear to erase the pict. Now choose Edit:Paste and your own picture should be in the file. Save it and try it out. The method can be used on png-files also to make a thumbnail. Just open them in Photoshop and copy to the clipboard.