/usr/share/mate-panel/applets/org.mate.panel.MateMenuApplet.mate-panel-applet is in mate-menu 18.04.3-2ubuntu1.
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 | [Applet Factory]
Id=MateMenuAppletFactory
InProcess=false
Location=/usr/lib/mate-menu/mate-menu.py
Name=MATE Menu Applet Factory
Description=Advanced MATE Menu
[MateMenuApplet]
Name=MATE Menu
Description=Advanced MATE Menu
Icon=start-here
MateComponentId=OAFIID:MATE_MateMenuApplet;
|