code: public static boolean isCsvFile(String filename)
      {
          String lowerFilename = filename.toLowerCase();
          return lowerFilename.endsWith("."+CommonFiles.CSV_EXT);
      }
docs: Returns <CODE>true</CODE> if the given filename is a CSV file.
  @param filename The filename to be checked
  @return <CODE>true</CODE> if the given filename is a CSV file