Objective-C Implementation File
Objective-C is a programming language that is both reflective and object orientated and is today usually found on the Mac OS X and iOS operating systems both developed by Apple for use on Macintosh Desktop Computers and Notebooks as well as mobile devices.
Implementation files that are used by Objective-C use the file extension .m.
How to open .m files?
Software to open .m files
What are .m files