/usr/share/app-install/desktop/reminders-app:com.ubuntu.reminders.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 | [Desktop Entry]
X-AppInstall-Package=reminders-app
X-AppInstall-Popcon=1
X-AppInstall-Section=universe
Name=Reminders
Comment=Ubuntu Reminders app, powered by Evernote
Exec=reminders %u
Icon=_usr_share_reminders_reminders
Terminal=false
Type=Application
X-Ubuntu-Touch=true
X-Ubuntu-Default-Department-ID=accessories
X-Ubuntu-Gettext-Domain=app-install-data
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