IO file extension - Modula-3 object file
What is io file? How to open io files?
File type specification:
The IO file extension is associated with the Modula-3 programming language. The .io file stores objects.
Modula-3 is used in research circles (influencing the designs of languages such as Java, C#, and Python) it has not been adopted widely in industry.
It was designed by Luca Cardelli, Jim Donahue, Mick Jordan, Bill Kalsow and Greg Nelson at the Digital Equipment Corporation (DEC) Systems Research Center (SRC) and Olivetti in the late 1980s.