Reg Add Hkcu Software Classes Clsid 86ca1aa0-34aa-4e8b-a509-50c905bae2a2 Inprocserver32 F Ve -

reg add <KeyName> [ /ve] [/t DataType] [/s Separator] [/d Data] [/f]

: This specific 128-bit identifier represents the file explorer context menu manager. reg add &lt;KeyName&gt; [ /ve] [/t DataType] [/s

reg add "HKCU\Software\Classes\CLSID\86CA1AA0-34AA-4E8B-A509-50C905BAE2A2\InprocServer32" /ve /f reg add &lt

[HKEY_CLASSES_ROOT\CLSID\86ca1aa0-34aa-4e8b-a509-50c905bae2a2] @="" find an empty string

This is why setting the default value to null (empty) effectively breaks the server registration. It is akin to removing the server's address. When the COM runtime attempts to load the object to display the new context menu, it will find the CLSID under HKCU , look for the DLL path in the default value of InprocServer32 , find an empty string, and fail to load it. Windows then gracefully falls back to the next best thing, which in this case is the classic context menu.