/usr/share/app-install/desktop/mate-screensaver:screensavers__cosmos-slideshow.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.
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X-AppInstall-Package=mate-screensaver
X-AppInstall-Popcon=307
X-AppInstall-Section=universe
Name=Cosmos
Comment=Display a slideshow of pictures of the cosmos
Exec=/usr/lib/mate-screensaver/slideshow --location=/usr/share/backgrounds/cosmos
TryExec=/usr/lib/mate-screensaver/slideshow
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver;
Keywords=MATE;screensaver;slideshow;cosmos;
OnlyShowIn=MATE;
X-Ubuntu-Gettext-Domain=app-install-data
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