/etc/xdg/cgcgtk3.knsrc is in kde-config-gtk-style 4:5.8.6-1+deb9u1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | [KNewStuff3]
Categories=GTK 3.x Theme/Style
Uncompress=always
InstallPath=.themes
|