title: How To Determine Which Version of Excel last saved a Workbook
body: <p>I have some excel files (.xls) that is being automatically generated from some system, and I am distributing these files to some users and they edit some fields in it and send it back to me.
  I need to know from each file they sent me which version of excel they are using (is it office 2003, 2007, 2010, 2013...?) because I want to know what is the lowest versions I need to keed support for.</p>
  
  <p>Is there a way to take these files and get the excel version that saved each one of them ?</p>
  
  <p>I tried this solution <a href="https://stackoverflow.com/questions/2070985/programmatically-finding-an-excel-files-excel-version">Programmatically finding an Excel file's Excel version</a> but it didn't do it...</p>