So in winecfg I have checked the Enable GTK3 Theming box under the staging tab and restarted my system, I don’t know if I am missing something but it has not applied the GTK3 theme that I have set in Plasma System Settings under Application Style > GNOME/GTK Application Style.
Does anyone know how I can fix this. Is there some other things I would need to do to get my windows applications to use GTK3 theme?