/etc/xdg/cgcicon.knsrc is in kde-config-gtk-style 4:5.5.5-0ubuntu1.
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=Xfce Icon Theme
Uncompress=always
InstallPath=.icons
|