Everytime I install something, I go in and delete any duplicate files for different Poser editions, and convert any .rsr files in the library folders into .png and delete the .rsr. It definitely serves to keep the folder size down.

And msg24_7, from what I've heard, .rsr files in the geometries folders are recreated by Poser if they're not there when you start the program up. Or at least, they used to be.

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If you're joking that's just cruel, but if you're being sarcastic, that's even worse.