/usr/share/applications/gallery-app.desktop is in gallery-app 0.0.67+14.04.20140408.1-0ubuntu2.
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 | [Desktop Entry]
Version=1.0
Name=Gallery
GenericName=Ubuntu Photo Viewer
X-GNOME-Fullname=Ubuntu Photo Viewer
Comment=Browse your photographs
Exec=gallery-app %u
Icon=gallery-app
StartupNotify=true
Terminal=false
Type=Application
MimeType=image/jpg;image/jpeg;
Categories=Graphics;Photography;RasterGraphics;Viewer;
X-Ayatana-Appmenu-Show-Stubs=false
X-Ubuntu-Touch=true
X-Ubuntu-Gettext-Domain=gallery-app
X-Ubuntu-Single-Instance=true
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