code: public void setAdditionalRoots(List<String> roots) {
  
          List<String> additionalRoots = new ArrayList<>();
          // making sure all paths end with the path separator CHAR
          for (String path : roots) {
              if (path != null) {
                  if (!path.endsWith(File.separator)) {
                      path += File.separator;
                  }
              }
              additionalRoots.add(path);
          }
          m_additionalRoots = additionalRoots;
      }
docs: Sets the additional root folders from which files can be viewed.<p>
  
  @param roots the list of additional root folders