Thanks for the reply!

I am running a 64bit PC, but in the reg I can only get as far as:

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\ Office\Common

and the key to mod is:

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\ Office\Common\Security\AllowLists\GraphicsFilterIm port

Is it OK to add the rest of this myself, or would that cause an issue?