/usr/share/applications/unity-lens-photos.desktop is in unity-lens-photos 1.0+17.10.20170605-0ubuntu3.
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 | [Desktop Entry]
Categories=Photography;
Name=Photos lens for Unity
GenericName=unity-lens-photos
Icon=unity-lens-photos
Terminal=false
Type=Application
X-Ubuntu-Gettext-Domain=unity-lens-photos
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