The mg file extension is associated with the Modula-3, a programming language developed in 1986 by DEC and Olivetti and used on operating system for VAX workstations.

The mg file contains generic module source code used by Modula-3.

This mg file type entry was marked as obsolete and no longer supported file format.

This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.