/usr/share/app-install/desktop/gnome-disk-utility:gnome-disk-image-writer.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=gnome-disk-utility
X-AppInstall-Popcon=67710
X-AppInstall-Section=main
Encoding=UTF-8
Name=Disk Image Writer
Comment=Write Disk Images to Devices
Exec=gnome-disks --restore-disk-image %U
Icon=drive-removable-media
MimeType=application/x-cd-image;application/x-raw-disk-image;application/x-raw-disk-image-xz-compressed;
Terminal=false
StartupNotify=false
Type=Application
NoDisplay=true
X-Ubuntu-Gettext-Domain=app-install-data
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