NWCONFIG-X-451: Warning: A file that is being installed would downgrade existing file name to an older version. Currently installed software that uses this file may not work correctly if you allow it to be overwritten. It probably should not be overwritten.
However, in the confirm box that follows, you may continue and overwrite this file anyway, if you wish to.
Source: NWCONFIG.NLM
Explanation: An existing file on the server is about to be overwritten. The date on the existing file is newer than the file that will overwrite it.
Action: It is recommended that the file not be overwritten unless it has been backed up. The file being installed might not work with currently installed software.