Files with m2o file extension can be found as fitted modula 2 files from Modula programming language. Probably very old.
M2O file extension - Modula Fitted Modula2 data
What is m2o file? How to open m2o files?
File type specification:
The m2o file extension seems to be related to Modula, a programming language developed in Switzerland in the 1970s by Niklaus Wirth.
The m2o file contains fitted modula 2 data. Most likely obsolete file type.
This m2o 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.