private String getPropertiesFileSuffix() {
    if (myResourceBundle == null) {
      return myUseXMLBasedPropertiesCheckBox.isSelected() ? ".xml" : ".properties";
    }
    return "." + myResourceBundle.getDefaultPropertiesFile().getContainingFile().getFileType().getDefaultExtension();
  }
private String getPropertiesFileSuffix()