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// *** Algorithm to replace a file extension by another

public static String replaceFileExtension(String filename, String newFileExtension) {
    int index = filename.lastIndexOf("."); //$NON-NLS-1$
    if (index >= 0) {
      return filename_p.substring(0, index) + (newFileExtension == null ? "" : "." + newFileExtension); //$NON-NLS-1$ //$NON-NLS-2$
    }
    return filename;
  }