I wanted to use a customized Excel template for all new files. Sure, I can create a new template in the templates folder and in Excel use
New and select my template or double-click on the template file.
But I wanted to use that template also when I'm creating a new file from the Explorer context menu with mouse right click ->
Create New. It takes always the built-in(?) template.
How can I get Excel and Windows Explorer to behave this way?