The FILE_ID.DIZ file is a necessary component for shareware authors to describe their program in standardized ASCII text format for BBS software. This file ensures that your program is accurately described online, regardless of who uploads it or which BBS system it’s posted on. ASP, Author Direct FDN, and most distribution services require a valid FILE_ID.DIZ file for distribution. It should contain the program name, version number, ASP identifier (optional), description separator, and detailed program description. Multiple disk information should have separate FILE_ID.DIZ files. Avoid using fancy graphics, ANSI sequences, or formatting in the file. Fred Hill’s DIZGEN utility helps create valid FILE_ID.DIZ files.
http://pcmicro.com/getdiz/file_id.html