RNFR is a String property that represents the path name for an existing FTP server file to be renamed using the combination of the RNFR and RNTO FTP commands. The value in RNFR is received from the FTP client using a CommandHandler, and is stored in the property when the Reply handler is signalled using the
TIdCommand instance for the command.
Subsequent execution of the RNTO Command Reply handler is required to complete the file renaming operation.
Note: The RNFR command reply handler requires that the TIdFTPServerThread for the connection be authenticated and have an AccessLevel other than idaAnonymousUser, or the reply handler has no effect.