Hi,
there is a 512px .png in the .afphoto container. I was able to extract it with a hex-editor, starting at 89504E47 0D0A1A0A (the magic bytes of png) all the way to the end of the container. Hope this helps, let me know if i can be of any further help!
Maybe you can also add it to "Set..." in the tab "Preferences => Launching"?
Thank you, Werner