Because I'm new here I cannot add my question to How can I add an item to the 'new' context menu?, so I start a "new" question.
As Windows 10 admin I can change the registry to create a new HTML file from the new-context-menu in File Explorer (in the way described in the link above). I can also make a template HTML file. Both actions work like a charm, thank you all.
But, for security reasons, I usually work without admin rights (as standard user). As standard user I cannot update the registry and the updated admin registry is apparently not transferred to the standard users.
That is, a standard user does not see the new-context-menu with the option of creating a HTML file.
Does anybody know how to get out of this Catch-22 situation?