Files with mmm file extension are used by MiraMon, a GIS program. An mmm file contains maps data.
MMM file extension - MiraMon maps data
What is mmm file? How to open mmm files?
File type specification:
The mmm file extension is associated with MiraMon, A GIS (Geographic Information System) software for Microsoft Windows operating system, developed by CREAF.
The mmm file contains uncompressed map used by MiraMon.