/usr/share/app-install/desktop/usb-imagewriter:imagewriter.desktop is in app-install-data 0.12.04.4.
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 12 13 14 | [Desktop Entry]
X-AppInstall-Package=usb-imagewriter
X-AppInstall-Popcon=344
X-AppInstall-Section=universe
Version=1.0
Type=Application
Terminal=false
Icon=gtk-execute
Exec=gksu imagewriter
Name=ImageWriter
Categories=GNOME;GTK;Utility
X-Ubuntu-Gettext-Domain=app-install-data
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