M - Objective-C Implementation File

What is a M file

Files with the simple M extension contain code written in the Objective-C programming language. It is commonly used for the implementation of classes. The Apple operating systems Mac OS X and iOS (for iPhone, iPad, etc.) use Objective-C as one of the most common programming languages for the implementation of apps.

M files save the Objective-C code it contains in a plain text format. Since it is used for the implementation of applications, the initial directive inside the M file is "@implementation". What M files do is initializing all necessary functions and variables inside the file. These functions and variables are often times referenced by other files written in Objective-C as well as header files.

Here's a small, but not exhaustive list of programs that can open M documents:

  • Apple compiler (Linux)
  • Apple Xcode (Mac)
  • Bare Bones BBEdit (Mac)
  • GNU Compiler Collection (Mac & Linux)
  • gVim (Windows)
  • jEdit (Windows, Mac & Linux)
  • MacroMates TextMate (Mac)
  • MacVim (Mac)
  • Richardson EditRocket (Windows, Mac & Linux)
  • Stepstone compiler (Linux)
  • Vim (Linux)
Extension M
MIME type text/plain
Useful links
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