Hi, Is there a way To find out the type of a file? eaither it is a TabDelimited or Excel97To2003 or Xlsx or csv or earlier version of 97 ? Because we will always receive single type of format as .Dat....xls”); if (isOld == false) { //save to pdf wb.Save(@“C:\Downloads\out...Save(@“C:\Downloads\out.pdf”); } } private bool IsOldVersion( ref...