/usr/share/applications/screensavers/xanalogtv.desktop is in xscreensaver-data-extra 5.36-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Name=XAnalogTV
Exec=/usr/lib/xscreensaver/xanalogtv -root
TryExec=/usr/lib/xscreensaver/xanalogtv
Comment=XAnalogTV shows a detailed simulation of an old TV set showing various test patterns, with various picture artifacts like snow, bloom, distortion, ghosting, and hash noise. It also simulates the TV warming up. It will cycle through 12 channels, some with images you give it, and some with color bars or nothing but static. Written by Trevor Blackwell.
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver;
OnlyShowIn=MATE;
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