regedit - how to reset to (value not set)

Question

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.

Answer 1

Just delete it. The default stays there with (value not set)