code: public void saveCacheFile(String rfsName, byte[] content, long dateLastModified) throws IOException {
  
          dateLastModified = simplifyDateLastModified(dateLastModified);
          File f = saveFile(rfsName, content);
          // set last modification date
          f.setLastModified(dateLastModified);
      }
docs: Saves the given file content in the disk cache.<p>
  
  @param rfsName the RFS name of the file to save the content in
  @param content the content of the file to save
  @param dateLastModified the date of last modification to set for the save file
  
  @throws IOException in case of disk access errors