title: Embed files in java using POI-XSSF
body: <p>I need to embed files 
  <code>(.ppt(x), .doc(x), .jpg, .txt,...)</code>
   in excel <code>(format xlsx)</code> using Java Apache POI.
   I have found an example to embed files in excel (format xls) using 
  POI-HSSF </p>
  
  <p>(<a href="https://stackoverflow.com/questions/16910503/embed-files-into-excel-using-apache-poi">Embed files into Excel using Apache POI</a>), </p>
  
  <p>but this example does not work with excel xlsx format. 
  Does somebody know if it is possible to do this using <code>POI-XSSF</code> ?</p>