Reference: FTP Server Administration File Menu
This is a standard open dialog that allows you to search for and select a particular message traffic file. A message traffic file is generated whenever you select Save Message Traffic File on the File Menu. The contents of the message traffic display are copied to a file that is uniquely named with the date and time as follows:
MT<year><month><day>-<hour><minute><second>.RTF
This file is stored in the local Beyond FTP directory when you are administering the local FTP server (at This Computer). It is stored on the sub-directory path Admin\MTFiles\<Server name> when you are administering a remote FTP server.