Try making a Gtk build for Windows

[Sejsel]

(again)

Possibly the simplest way to get a dark mode build for Windows.

[Sejsel]

Got the basic thing working to some extent, except for making it distributable along with themes.

Requires installing GtkSharp on Windows, or distributing the dll files along with the executable (we would want to do this).
There are GtkSharp.Dependencies and GtkSharp.Win32 packages on NuGet, both of which can be sort of made to work, but I haven't found a way to override themes locally yet.

Some combination with Eto.Test.Gtk on Windows actually worked including loading a theme from a local directory instead of using global settings.

Adwaita (I think) on Windows:

Arc-Dark-Solid on Windows: