title: Does NPOI have support to .xlsx format?
body: <p>Will NPOI DLL recognize <code>.xlsx</code> file? </p>
  
  <p>Currently I'm using NPOI 1.2.5 version DLL for Microsoft Excel 97-2003, but I need to access Excel sheets of extension <code>.xlsx</code> also.  </p>
  
  <p>Will NPOI support the above? </p>
  
  <p>Code snippet: </p>
  
  <pre><code>static void Main(string[] args) {
      XSSFWorkbook xssfwb;
  
      using(FileStream file=new FileStream(
              @"C:\Users\347702\Desktop\Hello.xlsx",
              FileMode.Open, FileAccess.Read)) {
          xssfwb=new XSSFWorkbook(file);
      }
  
      ISheet sheet=xssfwb.GetSheet("sheet1");
      sheet.GetRow(1048576);
      Console.WriteLine(sheet.GetRow(1048576).GetCell(0).StringCellValue);
  }
  </code></pre>