winapi - How to detect Windows 10 light/dark mode in Win32 application?

Question

A bit of context: Sciter (pure win32 application) is already capable to render UWP alike UIs:

in dark mode:

in light mode:

Windows 10.1803 introduces Dark/Light switch in Settings applet as seen here for example.

Question: how do I determine current type of that "app mode" in Win32 application?

Answer 1

Well, it looks like this option is not exposed to regular Win32 applications directly, however it can be set / retrieved through the AppsUseLightTheme key at the HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersionThemesPersonalize registry path.