/usr/share/mate-panel/applets/com.javispedro.topmenu.MatePanelApplet.mate-panel-applet is in mate-applet-topmenu 0.2.1+git20151210.8c6108f-3.
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 | [Applet Factory]
Id=TopMenuMatePanelAppletFactory
Location=/usr/lib/mate-applets/topmenu-mate-panel-applet
Name=TopMenu Mate Panel Applet Factory
Description=TopMenu Mate Panel Applet Factory
[TopMenuMatePanelApplet]
Name=TopMenu Panel Applet
Description=Shows the menubar from the current active window
Icon=topmenu-applet
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