Allowing dos and regedit in a restricted Windows

See
A very simple tricks I found after accidentally locking myself out of dos and regedit is to open notepad and type the following:

REGEDIT4
[HKEY_CURRENT_USERSoftwareMicrosoft

WindowsCurrentVersionPoliciesWinOldApp]
"Disabled"=dword:0
[HKEY_CURRENT_USERSoftwareMicrosoft
Windows
CurrentVersionPoliciesSystem]
"DisableRegistryTools"=dword:0

Save it as something.reg then run it. Simple.