/usr/share/app-install/desktop/mutt:mutt.desktop is in app-install-data 14.04.0.
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 | [Desktop Entry]
X-AppInstall-Package=mutt
X-AppInstall-Popcon=1236
X-AppInstall-Section=main
Categories=Office;Network;Email;
Comment=Simple text-based Mail User Agent
Exec=mutt %u
Icon=mutt
Name=mutt
MimeType=x-scheme-handler/mailto;
NoDisplay=true
Terminal=true
Type=Application
X-Ubuntu-Gettext-Domain=app-install-data
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