You can do this by deleting the default value (should be 'C:\Windows\System32\Windows.UI.FileExplorer.dll') under the following key:

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{86ca1aa0-34aa-4e8b-a509-50c905bae2a2}\InProcServer32

though IIRC a tool to escalate privileges is needed to be able to modify the key.

The tool I posted elsewhere in the thread has an option to restore the old context menu but its overkill to create an ISO and do a complete re-install just for that xD.