/usr/share/applications/screensavers/hypnowheel.desktop is in xscreensaver-gl-extra 5.36-1.
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 | [Desktop Entry]
Name=Hypnowheel
Exec=/usr/lib/xscreensaver/hypnowheel -root
TryExec=/usr/lib/xscreensaver/hypnowheel
Comment=Draws a series of overlapping, translucent spiral patterns. The tightness of their spirals fluctuates in and out. http://en.wikipedia.org/wiki/Moire_pattern Written by Jamie Zawinski.
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver;
OnlyShowIn=MATE;
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