/usr/share/themes/Numix/index.theme is in numix-gtk-theme 2.6.7-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 | [Desktop Entry]
Type=X-GNOME-Metatheme
Name=Numix
Comment=A modern flat theme
Encoding=UTF-8
[X-GNOME-Metatheme]
GtkTheme=Numix
IconTheme=Adwaita
MetacityTheme=Numix
ButtonLayout=:minimize,maximize,close
|