File Extension Search

.mm File Extension

Developer: N/A
File type: Objective-C++ Source File
You're here because you have a file that has a file extension ending in .mm. Files with the file extension .mm can only be launched by certain applications. It's possible that .mm files are data files rather than documents or media, which means they're not meant to be viewed at all.

what is a .mm file?

The Objective-C++ Source File is stored in the .m format and is affixed with .m extension and is used by Mac-based applications. These .m files are generally classified as developer files that contain source code written in both the Objective-C and C++ programming languages used for including C++ code within Mac-based applications. Objective-C++ is a language variant of Objective-C and a front-end to the GNU Compiler Collection that can compile source files that use a combination of C++ and Objective-C syntax. It was a byproduct of the non-intersection and consolidation of all the features of the three languages. In order to use Objective-C++, name the files with the .m file extension which will identify the file as Objective-C++ to the compiler, and allow mixing the languages. To avoid warnings and errors with an existing Objective-C file just rename one or more of your source files .mm instead of .m. to allow C++ features to set in.

how to open a .mm file?

Launch a .mm file, or any other file on your PC, by double-clicking it. If your file associations are set up correctly, the application that's meant to open your .mm file will open it. It's possible you may need to download or purchase the correct application. It's also possible that you have the correct application on your PC, but .mm files aren't yet associated with it. In this case, when you try to open a .mm file, you can tell Windows which application is the correct one for that file. From then on, opening a  .mm file will open the correct application. Click here to fix .mm file association errors

applications that open a .mm file

Apple TextEdit

Apple TextEdit

Apple TextEdit is a text editor program and an open-source word processor too, which is first used in NeXTSTEP and OPENSTEP, but now integrated in most recent versions of Mac OS X. It is also considered a GNUstep application for other operating systems that are Unix based, like Linux computers. This program is operated by Advanced Typography by Apple so expect several advanced typography related features. The main function of this software is to read and write documents in plain text, HTML formats, Rich Text Format, and Rich Text Format Directory. It can also open Simple Text files but does not have the capability to save documents of that format. Mac OS X version 10.3 supports Microsoft Word documents, while Mac OS X version 10.4 can open and save Word documents in XML file. Mac OS X version 10.5 is able to read and write Office Open XML as well as OpenDocument Text. Features included on TextEdit are formatted text support, addition of graphics, animations and other multi-media contents, automatic adjustment of letter spacing, as well as reading and writing support of character encodings.
Microsoft Notepad

Microsoft Notepad

Notepad is a basic text editor used to create plain documents. It is commonly used to view or edit text (.txt) files, and a simple tool for creating Web pages, and supports only the basic formatting in HTML documents. It also has a simple built-in logging function. Each time a file that initializes with .log is opened, the program inserts a text timestamp on the last line of the file. It accepts text from the Windows clipboard. This is helpful in stripping embedded font type and style codes from formatted text, such as when copying text from a Web page and pasting into an email message or other “What You See Is What You Get” text editor. The formatted text is temporarily pasted into Notepad, and then immediately copied again in stripped format to be pasted into the other program. Simple text editors like Notepad may be utilized to change text with markup, such as HTML. Early versions of Notepad offered only the most basic functions, such as finding text. Newer versions of Windows include an updated version of Notepad with a search and replace function (Ctrl + H), as well as Ctrl + F for search and similar keyboard shortcuts. It makes use of a built-in window class named edit. In older versions such as Windows 95, Windows 98, Windows Me and Windows 3.1, there is a 64k limit on the size of the file being edited, an operating system limit of the EDIT class.
Microsoft WordPad

Microsoft WordPad

Files with .rtf, .openbsd, and .readme extensions are some of the files associated or which can be opened with the Microsoft WordPad. RTF files are text documents that can be created, opened, viewed, edited or changed using word processing applications for both Mac and Microsoft Windows-based computers, like Microsoft WordPad for Windows and Microsoft Word 2011 for Mac. It gives the users a wide cross compatibility support, which was the central objective for the improvement of the Rich Text Format technology, and these .rtf files can even be opened, viewed and used with database applications. The OpenBSD Unix platform is frequently utilized in computers running as Web servers of a secure network. OpenBSD files may be saved in directories of the OpenBSD system that were generated upon installation of the software applications. Files with the .openbsd extension can be opened by standard text editors, particularly well-known like Microsoft Notepad, and this text editor may also be utilized to create and edit OPENBSD files. Files with the .readme extension are text documents engaged to give users with beneficial information and specific details about certain applications installed in the system. These files can be opened, viewed and edited with a selection of text editors including Microsoft Notepad and Microsoft WordPad.

a word of warning

Be careful not to rename the extension on .mm files, or any other files. This will not change the file type. Only special conversion software can change a file from one file type to another.

what is a file extension?

A file extension is the set of three or four characters at the end of a filename; in this case, .mm. File extensions tell you what type of file it is, and tell Windows what programs can open it. Windows often associates a default program to each file extension, so that when you double-click the file, the program launches automatically. When that program is no longer on your PC, you can sometimes get an error when you try to open the associated file.
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