This file is indexed.

/usr/bin/cinnamon-preview-gtk-theme is in cinnamon 2.8.6-1ubuntu1.

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

The actual contents of the file can be viewed below.

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#! /usr/bin/python

import gi, sys
from gi.repository import Gtk

if __name__ == '__main__':
    import signal
    signal.signal(signal.SIGINT, signal.SIG_DFL)

    if len(sys.argv) != 2:
        print "Usage: cinnamon-preview-gtk-theme theme-name"
        exit(1)
    else:
        theme_name = sys.argv[1]        
        settings = Gtk.Settings.get_default()
        settings.set_string_property ("gtk-theme-name", theme_name, "gtkrc:0");

        window = Gtk.Window()

        vbox = Gtk.VBox()
        hbox = Gtk.HBox()
        button = Gtk.Button()
        check = Gtk.CheckButton()
        check.set_active(True)
        radio = Gtk.RadioButton()
        hbox.pack_start(button, False, False, 2)
        button.set_label("Button")
        hbox.pack_start(check, False, False, 2)
        hbox.pack_start(radio, False, False, 2)

        vbox.pack_start(hbox, False, False, 2)    

        window.add(vbox)
        
        window.set_default_size(320, 200)

        window.set_decorated(False)
        window.show_all()


        window.connect("destroy", Gtk.main_quit)
        Gtk.main()