/usr/share/applications/screensavers/flipscreen3d.desktop is in xscreensaver-gl 5.15-3+deb7u1.
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=FlipScreen3D
Exec=/usr/lib/xscreensaver/flipscreen3d -root
TryExec=/usr/lib/xscreensaver/flipscreen3d
Comment=Grabs an image of the desktop, turns it into a GL texture map, and spins it around and deforms it in various ways. Written by Ben Buxton and Jamie Zawinski.
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver;
OnlyShowIn=GNOME;
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