# File lib/spreadsheet/workbook.rb, line 9
   def initialize(file)
      super

      @file       = file
      @format     = Format.new

      @active_sheet = 0
      @first_sheet  = 0
      @biffsize     = 0
      @date_system  = 1900
      @xf_index     = 16

      @worksheets = []
      @formats    = []

      @url_format = add_format(:color=>"blue", :underline=>1)
   end