Ok, I downloaded Mapsource. Created C:\ProgramData\Garmin\\Maps (my Win10 sees ProgramData and Program Files as the same thing). I then loaded the whole City_Navigator_North_America_NT_2025_10.gmap folder into it. Then ran the Unlock app.
When I open Mapsource I hit File>Open. It takes me to a browse window. I locate City_Navigator_North_America_NT_2025_10.gmap in the Garmin\Maps folder. Browser then shows 2 folders: CNNANT_2025_10_mdr and Product1. Neither folder or its contents does anything like read or load: "No items match your search".
So back to my question: How do I read/load City_Navigator_North_America_NT_2025_10.gmap into Mapsouce?
Thank you for your help!