# File lib/spreadsheet/workbook.rb, line 215
   def store_style
      record = 0x0293
      length = 0x0004

      ixfe    = 0x8000
      builtin = 0x00
      iLevel  = 0xff

      header = [record, length].pack("vv")
      data   = [ixfe, builtin, iLevel].pack("vCC")

      append(header, data)
   end