adprep folder from installation media

start.run.cmd on older server

  • ADPREP /forestprep command extends the schema with quite a few new classes and attributes. These new schema objects are necessary for the new features supported by Windows Server 2008. You can view the schema extensions by looking at the .ldf files in the‘sources’adprep directory on the Windows Server 2008 DVD. These files contain LDIF entries for adding and modifying new and existing classes and attributes.
  • ADPREP /domainprep creates new containers and objects, modifies ACLs on some objects, and changes the meaning of the Everyone security principal.
  • Before you can run ADPREP /domainprep, you must be sure that the updates from /forestprep have replicated to all domain controllers in the forest.

http://www.petri.co.il/windows-server-2008-adprep.htm