This file is indexed.

/usr/lib/gnome-flashback/gnome-flashback-compiz is in gnome-session-flashback 1:3.18.2-1ubuntu1.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/bin/sh

if [ -z $XDG_CURRENT_DESKTOP ]; then
  export XDG_CURRENT_DESKTOP="GNOME-Flashback:Unity"
fi

exec gnome-session --session=gnome-flashback-compiz "$@"