/usr/share/app-install/desktop/mate-media:mate-volume-control.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 19 20 21 | [Desktop Entry]
X-AppInstall-Package=mate-media
X-AppInstall-Popcon=2
X-AppInstall-Section=universe
Name=Sound
Comment=Change sound volume and sound events
Exec=mate-volume-control
Icon=multimedia-volume-control
Terminal=false
Type=Application
StartupNotify=true
Categories=AudioVideo;Mixer;Settings;HardwareSettings;
Keywords=MATE;volume;control;mixer;settings;sound;events;
OnlyShowIn=MATE;
X-MATE-Bugzilla-Bugzilla=MATE
X-MATE-Bugzilla-Product=mate-media
X-MATE-Bugzilla-Component=mate-volume-control
X-MATE-Bugzilla-Version=1.10.0
X-Ubuntu-Gettext-Domain=app-install-data
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