I know what I was doing, when the error began.  I was using a Python script to generate poses.  It was an older script that turned out to have some errors -- Poser files can apparently have more varied bracket formatting than we had assumed while developing it -- so I was modifying the script as I went along, as well as creating and deleting and recreating poses the whole time.

I don't think I deleted any folders.  I did create a few during the process.  The transitional files, all those WIP poses, are long gone.

IIRC, in the midst of all of the above, I was working in that pose folder, possibly examining the files in Poser Editor, when I double-clicked one and oops.

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Cage can be an opinionated jerk who posts without thinking.  He apologizes for this.  He's honestly not trying to be a turkeyhead.

Cage had some freebies, compatible with Poser 11 and below.  His Python scripts were saved at archive.org, along with the rest of the Morphography site, where they were hosted.