Files that contain the .diz extension are descriptor files that describe the different files that are contained in a ZIP file. A ZIP file contains multiple files that have been compressed into a single file, making it easier to distribute the files and freeing up storage space. The DIZ file is saved in plain text format and describes what is contained in the ZIP file.
DIZ files were common back in the days of bulletin board systems, where users dialed in and uploaded and downloaded software. The file_id.diz file in the ZIP files were used to generate the file listings on the BBS.
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File.org aims to be the go-to resource for file type- and related software information. We spend countless hours researching various file formats and software that can open, convert, create or otherwise work with those files.
If you have additional information about the DIZ file format or software that uses files with the DIZ suffix, please do get in touch - we would love hearing from you.