/usr/share/app-install/desktop/gnome-disk-utility:gnome-disk-image-mounter.desktop is in app-install-data 15.10.
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 15 16 17 18 | [Desktop Entry]
X-AppInstall-Package=gnome-disk-utility
X-AppInstall-Popcon=24608
X-AppInstall-Section=main
Encoding=UTF-8
Name=Disk Image Mounter
Comment=Mount Disk Images
Exec=gnome-disk-image-mounter %U
Icon=drive-removable-media
MimeType=application/x-cd-image;application/x-raw-disk-image;
Terminal=false
StartupNotify=false
Type=Application
NoDisplay=true
X-Ubuntu-Gettext-Domain=app-install-data
|