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Let's say the key is HKEY_CLASSES_ROOT\Folder\shell,
and i edit the value to empty
Then how can this registry key reset back to (value not set) state ? I tried reg add HKCR\Folder\Shell /t REG_SZ /f(without /d) but no luck.
reg add HKCR\Folder\Shell /t REG_SZ /f
Just delete it. The default stays there with (value not set)