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Added information that this is not only working solution to encourage people to try other answers if this one does not suit them.
Hooch
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I have no idea why or what I have broken in the process. But here is what worked for me.

  1. Kill process Explorer.exe via Task Manager.

  2. Delete this registry key.

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\FolderTypes\{ef87b4cb-f2ce-4785-8658-4ca6c63e38c6}\TopViews\{00000000-0000-0000-0000-000000000000}

  1. Start process Explorer.exe via Task Manager.

This is one of many answers posted here. Feel free to try other people's suggestions. If you combine all answers in one I'll accept your answer.

Hooch
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