Usage note 8 of LISTSERV README: 8. LISTSERV's A-disk will contain, after installation, a file called LISTSERV FILELIST which is of crucial importance and should not be overwritten. If the userid of your server is LISTSERV and you use FILELIST rather than FLIST to view files, be aware of the fact that the FILELIST command may, in certain cases, gladly overwrite this file without prompting you for confirmation nor even notifying you. In particular, typing SAVE or FILE while within FILELIST is a no-no.