/usr/share/dbus-1/services/org.mate.panel.applet.TopMenuMatePanelAppletFactory.service 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 | [D-BUS Service]
Name=org.mate.panel.applet.TopMenuMatePanelAppletFactory
Exec=/usr/lib/mate-applets/topmenu-mate-panel-applet
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