/usr/share/gnome-panel/4.0/applets/org.gnome.panel.Apt_Watch.panel-applet is in apt-watch-gnome 0.4.0-1ubuntu2.
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 | [Applet Factory]
Id=Apt_WatchApplet_Factory
Location=/usr/lib/apt-watch/apt-watch
Name=Apt-Watch Applet Factory
Description=Factory for Apt-Watch applets
[Apt_WatchApplet]
Name=APT Update Watcher
Description=Automatically checks for software updates
Icon=gnome-applets.png
BonoboId=OAFIID:Apt_WatchApplet
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