/usr/share/applications/screensavers/twang.desktop is in xscreensaver-data-extra 5.15-2ubuntu1.
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=Twang
Exec=/usr/lib/xscreensaver/twang -root
TryExec=/usr/lib/xscreensaver/twang
Comment=Divides the screen into a grid, and plucks them. Written by Dan Bornstein.
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver;
OnlyShowIn=GNOME;
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