Zip Archive Description File
Text files contained in zip archives that have a description of the contents of the archive are known as File_ID.DIZ files which use the file extension .diz.
These file originally came in to being in the early days of Bulletin Boards so that people uploading to the board didn't have to manually type a description of the files uploaded.
How to open .diz files?
Software to open .diz files
What are .diz files