/usr/share/applications/screensavers/glsnake.desktop is in xscreensaver-gl 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=GLSnake
Exec=/usr/lib/xscreensaver/glsnake -root
TryExec=/usr/lib/xscreensaver/glsnake
Comment=Draws a simulation of the Rubik's Snake puzzle. See also the "Rubik" and "Cube21" screen savers. http://en.wikipedia.org/wiki/Rubik%27s_Snake Written by Jamie Wilkinson, Andrew Bennetts, and Peter Aylett.
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver;
OnlyShowIn=GNOME;
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