Because they are essentially simple , you don't need specialized software to read them: How do I use a .DIZ file? - Super User

: To ensure compatibility across different BBS software, a standard FILE_ID.DIZ was strictly limited to 10 lines of text , with each line being no more than 45 characters wide.

A FILE_ID.DIZ file is a classic piece of computing history, a plain-text "Description In Zipfile" used to identify the contents of a software archive. Historically essential for Bulletin Board Systems (BBS) in the early 1990s, these files allowed sysops and users to instantly see what a program was without extracting the entire package. The Role of FILE_ID.DIZ

: While largely replaced by more modern README files, the format remains a staple in the "warez scene" for documenting cracked software releases, often including the group name and release date. How to Use and View Them