P3DO explorer is great but setting the thumbnails IN windows gives you the ... well thumbnail every time you need it. You can make it apply to all folders at once, see pic. (I know it is in total gibberish but the menus are the same places ;o) )

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You just can't put the words "Poserites" and "happy" in the same sentence - didn't you know that? LaurieA
  Using Poser since 2002. Currently at Version 11.1 - Win 10.