/usr/share/app-install/desktop/mysql-client.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=mysql-client
X-AppInstall-Popcon=1657
X-AppInstall-Section=main
Version=1.0
Name=MySQL Client
Type=Application
Terminal=false
Categories=Database;Utility;
X-Ubuntu-Gettext-Domain=app-install-data
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