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require "win32ole"

cd = WIN32OLE.new("MSComDlg.CommonDialog")

cd.filter = "All Files(*.*)|*.*" +"|Ruby Files(*.rb)|*.rb"
cd.filterIndex = 2

cd.maxFileSize = 128    # Set MaxFileSize

cd.showOpen()

file = cd.fileName      # Retrieve file, path

if not file or file==""
   puts "No filename entered."
else
   puts "The user selected: #{file}\n"
end