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#21
Just a random, but hopefully helpful, observation: If you right-click on WinDirStat.exe in Explorer, and select "Run as administrator" from the pop-up menu, it will tell you more than running it at normal user privilege. I'm not sure it will illuminate the $Extend stuff you encountered, but I'd be curious to find out if it does. I don't see any hidden items like that on any of my Win10 machines, so perhaps you could try? Thanks!
--Ed--