title: BiffException while reading an excel sheet
body: <p>I have a code to read from an excel sheet which is in old format(97-2003). I made some changes to data and ended up a 2007 format excel sheet. When I used this xlsx sheet instead of xls sheet, I am getting this: </p>
  
  <pre><code>jxl.read.biff.BiffException: Unable to recognize OLE stream
      at jxl.read.biff.CompoundFile.&lt;init&gt;(CompoundFile.java:116)
      at jxl.read.biff.File.&lt;init&gt;(File.java:127)
      at jxl.Workbook.getWorkbook(Workbook.java:268)
      at readexcel.ReadExcel.readContent(ReadExcel.java:50)
      at readexcel.ReadExcel.init(ReadExcel.java:25)
      at readexcel.ReadExcel.main(ReadExcel.java:183)
  </code></pre>