/usr/share/applications/screensavers/qix.desktop is in xscreensaver-data-extra 5.30-1+deb8u2.
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=Qix
Exec=/usr/lib/xscreensaver/qix -root
TryExec=/usr/lib/xscreensaver/qix
Comment=Bounces a series of line segments around the screen, and uses variations on this basic motion pattern to produce all sorts of different presentations: line segments, filled polygons, and overlapping translucent areas. http://en.wikipedia.org/wiki/Qix Written by Jamie Zawinski.
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver;
OnlyShowIn=GNOME;
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