file-chooser.rb

require 'gtk2'
dialog = Gtk::FileChooserDialog.new("Open File",
                                     nil,
                                     Gtk::FileChooser::ACTION_OPEN,
                                     nil,
                                     [Gtk::Stock::CANCEL, Gtk::Dialog::RESPONSE_CANCEL],
                                     [Gtk::Stock::OPEN, Gtk::Dialog::RESPONSE_ACCEPT])


dialog.select_multiple = true
if dialog.run == Gtk::Dialog::RESPONSE_ACCEPT
    dialog.filenames.each do |name| puts name end
end
dialog.destroy