/usr/share/app-install/desktop/stackapplet:stackapplet.desktop is in app-install-data 14.04.0.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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X-AppInstall-Package=stackapplet
X-AppInstall-Popcon=2
X-AppInstall-Section=universe
Name=StackApplet
Comment=Launch the StackApplet indicator
Exec=/usr/share/stackapplet/stackapplet.py
Icon=stackexchange
Type=Application
Categories=GNOME;GTK;Utility;
X-Ubuntu-Gettext-Domain=app-install-data
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