/usr/share/app-install/desktop/gnome-calendar:org.gnome.Calendar.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-calendar
X-AppInstall-Section=universe
Name=Calendar
Comment=Access, and manage calendar
Exec=gnome-calendar
Icon=gnome-calendar
Terminal=false
Type=Application
StartupNotify=true
OnlyShowIn=GNOME;
Categories=GNOME;GTK;Utility;Core;
Keywords=Calendar;Event;Reminder;
MimeType=text/calendar;
DBusActivatable=true
X-Ubuntu-Gettext-Domain=app-install-data
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