Comment by ptx

15 days ago

But they had dark themes for the XP theming engine, e.g. the Zune theme, didn't they? They could make the dark mode switch to a dark theme for XP-style themed controls and configure dark colors for the Win32 system colors.

Yes, and this is also how Windows 10/11 explorer turns some parts of its UI dark like scrollbars. But notably, Microsoft refuses to officially support Explorer's dark control themes or ship a complete dark theme, and because the theming engine only loads themes signed by Microsoft, no one else can ship one either without patching the OS.