I installed Mapfactor Navigator 20 on a Globe 800 GPS running under WinCE 6. Everything works with an interface slightly different compared to the android version, except the night mode.
To access the night mode, I go to the main menu where a specific icon allows that, night mode, or day mode.
I set the application day mode to "default", and night mode to "night mode default".
When I switch to night mode there is no effect on the map, just on the menu. I tried a simulation with no success.
On android version, night mode can be on auto, or activated and the result is good, the map is on a dark mode.
As I still have an old PDA/GPS under WinCE 5, I installed and tried the same configuration without night mode effective.