[GNC] Dark theme on Windows

[Geert Janssens]

I have come across the following combination of settings to enable a default 
dark theme on linux. Creating a file settings.ini in $HOME/.config/gtk-3.0 
with this contents

[Settings]
gtk-application-prefer-dark-theme=true
gtk-theme-name=Adwaita

gives me the default Adwaita-dark theme. I would be interested to know if this 
also works on Windows (the file should be created in
%LOCALAPPDATA%\gtk-3.0
instead).

If so this could be added to our wiki here:
https://wiki.gnucash.org/wiki/GTK3#Dark_Themes

Can someone run this experiment and report back ?

Thanks,

Geert