if you delete it, it will be recreated on restart of the server (I think it will get recreated eventually if you don't restart the server, but I don't know how long you would have to wait)

hope that helps....

Stop the Domino server and delete the DBDIRMAN.NSF database. Restart the Domino server and the DBDIRMAN.NSF database is recreated.  You can also recreate the DBDIRMAN while the server is up by stopping the DBDIRMAN task.  You must Tell router quit, then Tell dmdirman quit, run DBFLUSH a couple of times, then delete the DBDIRMAN.NSF.  Then when you Load DBDIRMAN, the file should be recreated.