code: public String addDefaultFileNameToFolder(String rfsName, boolean isFolder) {
  
          StringBuffer name = new StringBuffer(rfsName);
  
          if (isFolder) {
              // vfs folder case
              name.append(EXPORT_DEFAULT_FILE);
          }
          return name.toString();
      }
docs: Returns the real file system name plus the default file name.<p>
  
  @param rfsName the real file system name to append the default file name to
  @param isFolder signals whether the according virtual file system resource is an folder or not
  
  @return the real file system name plus the default file name