A mingw file extension is related to the MinGW, a development environment for Windows and used for its makefile.
MINGW file extension - MinGW makefile
What is mingw file? How to open mingw files?
File type specification:
The mingw file extension is associated with the MinGW, a free and open source software development for Microsoft Windows operating system.
The mingw file contains makefile.
Most likely some old format without support. No further information could be found.
This mingw 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.