/usr/share/app-install/desktop/matita:matita.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.
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X-AppInstall-Package=matita
X-AppInstall-Popcon=6
X-AppInstall-Section=universe
Name=Matita
Comment=Interactive theorem prover
Exec=matita
Icon=_usr_share_matita_icons_matita
Terminal=false
Type=Application
Categories=Education;Science;Math
X-Ubuntu-Gettext-Domain=app-install-data
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