/usr/share/applications/mb-applet-clock.desktop is in matchbox-panel 0.9.3-9+b1.
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 | [Desktop Entry]
Name=Clock
Comment=Panel based clock
Exec=mb-applet-clock
Type=PanelApp
Icon=minitime.png
Categories=Panel;Utility;MB
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