title: system file, read write o create custom metadata or attributes extended
body: <p>:</p>
  
  <p>I am looking for a way to read, write or create (custom) tags, extended attributes or metadata from any file. Without libraries and language c or c + +. I think I can be with fopen, fread, fwrite, but not how to access the metadata.</p>
  
  <p>Thanks in advance,</p>