Files with nmm file suffix are related to the Nightmare module format.
There is one other file type using
the NMM file extension!
.nmm - Microsoft 3D Movie Maker recorded video
NMM file extension - Nightmare module
What is nmm file? How to open nmm files?
File type specification:
The nmm file extension is associated with the Nightmare, a basic hacking tool for Microsoft Windows, which allows users to hack Gameboy Advance ROM images.
The nmm file stores module for Nightmare program.
This nmm 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.