.MM File

File extension mm is associated with Apple Xcode, an integrated development environment (IDE) for Mac OS X (macOS).

The mm file contains core C program.

Xcode compile Objective-C++ (an Objective-C/C++ hybrid) if implementation file has file extension .mm.

How to open:

Use Apple Xcode IDE to work with *.mm files.

How to convert:

Possibly can be compiled to binary or executable format.