How to down load file.

#!/usr/bin/env ruby

require 'test/unit'
require 'rubygems'
require 'watir'
require 'win32ole'



class FileUpLoadTest < Test::Unit::TestCase
 include Watir

    def test_fileup
     ie = Watir::IE.new
     ie.goto('foo.com/fileup.html')
     assert(ie.file_field(:name,"register_data").exists?,message="error none file field")

#Start down load
     ie.file_field(:id,'register_data').click_no_wait   
# should click_no_wait,otherwise wait forever behind modal window. 
 
     windwName_dwn = "ファイルのダウンロード"
     windwName_sve = "名前を付けて保存"
     autoit=WIN32OLE.new("AutoItX3.Control")
     autoit.WinWait(windwName_dwn)
     autoit.WinActivate(windwName_dwn)
     autoit.ControlClick(windwName_dwn,"","[CLASS:Button;INSTANCE:2]")
     pathAndName = "var/foo.txt"
     autoit.WinWait(windwName_sv)
     autoit.WinActivate(windwName_sv)
     autoit.ControlSetText(windwName_sv, "", 1148, "#{pathAndName}")
     autoit.ControlClick(windwName_sv,"","[CLASS:Button;INSTANCE:2]")
     autoit.WinWait("ダウンロードの完了")
  end
end