I can't tell you what the other 4k are used for (how big was the bmp? Did you try 32 bit .pct, which I think is supposed to be the closest format to .rsr thumbs?) but I can tell you that 15k is not big enough to contain any reasonable amount of geometry info no matter what format you compress it in. And I can tell you that you can edit the internal part of a pp2, cr2 or pz2 file as much as you want without deleting the thumbnail rsr and your changes will come through. I do it all the time. It's the mainstay of my products. On the other hand, when I modify obj files and forget to delete the .rsr then the changes don't come through. Maybe this experiment will convince you: Make a new library directory and fill it with a number of different props. Delete all the .rsr files from that directory. Take an unrelated .rsr from another directory and paste it into the new directory. Rename it to match the name of the first prop. Paste again and rename to match the second prop etc. Now test your props in Poser. They will all have the same thumb but all will continue to be the prop they originally were with no similarity to the thing the .rsr came from. You can also make new .rsr thumbs from 32 bit .pct files using the free utility "rsr converter". That's done with no reference whatsoever to any pp2, cr2 or pz2, yet they work just fine.

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