Windows 10 has introduced the dark mode, which many apps already follow, like Google Chrome and Firefox. The configuration can be queried in the registry's following location:
Key: HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Themes\Personalize
Value: AppsUseLightTheme
When the value equals 0 (DWORD), it means it is in dark mode. Altering the value triggers immediatelly Windows Explorer to go/exit dark mode.
It is already possible to change the editor's theme, but it would be wonderful if the notepad++'s window itself could follow Windows's dark mode when enabled.