An mmj file extension is related to the MobileMapper Office and used for its job files.
MMJ file extension - MobileMapper Office job
What is mmj file? How to open mmj files?
File type specification:
The mmj file extension is associated with the MobileMapper Office, a GIS (geographic information system) and GPS navigation device developed by Magellan.
The mmj file stores a job settings used to automate processes.
The MobileMapper Office is obsolete product.
This mmj 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.