/usr/share/app-install/desktop/mate-gnome-main-menu-applet:mate-screensaver-lock.desktop is in app-install-data 15.10.
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 12 13 14 15 16 | [Desktop Entry]
X-AppInstall-Package=mate-gnome-main-menu-applet
X-AppInstall-Popcon=22
X-AppInstall-Section=universe
Name=Lock Screen
Version=1.0
Icon=gnome-lockscreen
Exec=mate-screensaver-command --lock
Terminal=false
Type=Application
Categories=Application;System;
Keywords=MATE;main;menu;lock;screen;
OnlyShowIn=MATE;
Hidden=true
X-Ubuntu-Gettext-Domain=app-install-data
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