A family of Microsoft relational database management systems designed for ease of use.
Your reply is many years late.
Also you have missed the whole point of the discussion, which was not to do with setting up trusted locations. It was to do with one small aspect of an Access Macro not working, even when the macro was built with Access' own inbuilt expression builder. (Namely hiding the header section of a form)
All the steps you have outlined are about databases as a whole, and which I had already attended to when setting up my databases and deciding where to locate them. My databases were already in Trusted Locations. My databases opened, worked, allowed me to use and modify them, create macros - everything.
Just this one bug in Access that wouldn't allow me to do something I had been doing for years - use a macro to head the header section in a form when I didn't want that part of the form visible.