Comment by Qerub

This reminds me of Alan Kay's OOPSLA 1997 presentation "The Computer Revolution Hasn’t Happened Yet" when he describes the Air Force / Burroughs 220 file format from 1961 where the file/tape contained both the data and the procedures to read/write/print them: https://youtu.be/oKg1hTOQXoY?t=1355