# File lib/ole/storage/meta_data.rb, line 116
      def [] key
        pair = Types::PropertySet::PROPERTY_MAP[key.to_s] or return nil
        file = FILE_MAP[pair.first] or return nil
        dirent = @ole.root[file] or return nil
        dirent.open { |io| return Types::PropertySet.new(io)[key] }
      end