/usr/share/click/hooks/ubuntu-app-launch-desktop.hook is in ubuntu-app-launch 0.5+15.10.20150817-0ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | Pattern: ${home}/.cache/ubuntu-app-launch/desktop/${id}.desktop
Exec: /usr/lib/x86_64-linux-gnu/ubuntu-app-launch/desktop-hook
User-Level: yes
Hook-Name: desktop
|