title: how to import oracle 11g dump file to 10g oracle
body: <p>when I tried to import oracle database 11g into oracle 10g I got this error.</p>
  <blockquote>
  <p>IMP:00010 Not a valid export file. header failed identification</p>
  <p>IMP:00000 Import terminated unsucessfully</p>
  </blockquote>
  <p>any help, please</p>