code: private void readConfigFromFile(URL file) throws IOException {
          FOKLogger.info(Config.class.getName(), "Reading config from local file...");
          InputStream inputStream = file.openStream();
          offlineProps.load(inputStream);
          inputStream.close();
      }
docs: Imports the specified {@code *.properties}-file
  
  @param file The {@code *.properties}-file to import.
  @throws IOException If the specified file does not exist or cannot be read.