Importing ldf files is one way to extend an Active Directory Schema. In 2003 you could use ldifde to import ldif or ldf files. In 2008 you’ll be happy to know the syntax hasn’t changed. To import directory objects use the following command ldifde–i-ffilename-sservername:port-m-ausername domain password To export directory objects use the following command ldifde-e-ffilename-sservername:port-m-ausername domain password