# File lib/spreadsheet/excel/writer/workbook.rb, line 263 def write_dsf workbook, writer data = [ 0x00, # 0 = Only the BIFF8 “Workbook” stream is present # 1 = Additional BIFF5/BIFF7 “Book” stream is in the file ] write_op writer, 0x0161, data.pack('v') end