/usr/share/applications/org.gnome.Books.desktop is in gnome-documents 3.18.2-1.
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]
Name=Books
Comment=Access, manage and share books
Exec=gnome-books
# FIXME icon
Icon=gnome-books
Terminal=false
Type=Application
StartupNotify=true
DBusActivatable=true
OnlyShowIn=GNOME;
Categories=GNOME;GTK;Utility;Core;
Keywords=Books;Comics;ePub;PDF;
X-Ubuntu-Gettext-Domain=gnome-documents
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