/usr/share/applications/screensavers/whirlwindwarp.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.
1 2 3 4 5 6 7 8 9 10 | [Desktop Entry]
Name=WhirlWindWarp
Exec=/usr/lib/xscreensaver/whirlwindwarp -root
TryExec=/usr/lib/xscreensaver/whirlwindwarp
Comment=Floating stars are acted upon by a mixture of simple 2D forcefields. The strength of each forcefield changes continuously, and it is also switched on and off at random. Written by Paul 'Joey' Clark.
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver;
OnlyShowIn=MATE;
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