/usr/share/applications/screensavers/blaster.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.
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Name=Blaster
Exec=/usr/lib/xscreensaver/blaster -root
TryExec=/usr/lib/xscreensaver/blaster
Comment=Draws a simulation of flying space-combat robots (cleverly disguised as colored circles) doing battle in front of a moving star field. Written by Jonathan Lin.
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver;
OnlyShowIn=GNOME;
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