An mgrs file extension is related to the Military Grid Reference System.
MGRS file extension - Military Grid Reference System data
What is mgrs file? How to open mgrs files?
File type specification:
The mgrs file extension is associated with the Military Grid Reference System (MGRS), a geocoordinate standard used by NATO militaries for locating points on the Earth.
The mgrs file stores various data used by the Military Grid Reference System.
This mgrs 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.