M File Extension
Objective-C Implementation Format
- File Type m
- Developer Apple
- Popularity
- Application Sublime Text
- Category Developer Files
- Format Text
What is a M file?
Objective-C Implementation Format, identified by the M extension, is a Developer Files type and includes 1166 files.
The Objective-C Implementation Format (M) was developed by Apple, which created file format and 72 programs to work with them.
M files are supported by Mac OS, Windows and Linux. To open a M file, you can choose from 4 programs such as Xcode, Visual Studio Code and Sublime Text.
Programs that support M files
How to open a M file?
If you cannot open a M file, it is most often due to missing software. Select a program from the list according to your operating system. Then go to the official website of the program developer, download it, and install it on your device.
The most popular programs for working with M files are Xcode, Visual Studio Code and Sublime Text. To install the latest version of Sublime Text on your computer, visit the Sublime HQ Pty website where you can download the version available for all operating systems.
After completing the installation, M files should be recognized by the system and linked to Sublime Text.
Set Sublime Text as the default M application
Changing the default program in Windows
- Right click on your M file, then select "Open with" and click "Choose another application";
- From the options listed in the pop-up window, specifically choose Sublime Text as the application to handle your M file;
- Be sure to check the "Always use this app" checkbox and click "OK" to save your preference.
Change the default app that opens a file on Mac
- Right-click or use Control + Left-click on the desired M file to open a menu where you can choose from multiple actions;
- Select "Open in application" and click "Other";
- In the lower section of the window, you’ll find the "Enable" menu, with "Recommended Programs" pre-selected as the default option;
- Select "All Programs" in this menu, and then search for Sublime Text. Check the box next to "Always open in app" to make sure it’s the default option.
How to edit a M file?
To edit M files, you need to install specialized software that allows you not only to open but also to modify developer files. Online M editors usually provide fewer features than software created specifically for Objective-C Implementation Format.
List of Top M editors 2026
Taking the above factors into account, we have selected a list of M editors currently available.
| M Editor Software | Developer | Platforms | Overall Rating |
|---|---|---|---|
| Sublime Text | Sublime HQ Pty | Windows, Mac OS, Linux | 4.9 out of 5 (44 reviews) |
| Xcode | Apple | Mac OS | 4.7 out of 5 (43 reviews) |
| Atom | - | Windows, Mac OS, Linux | 4.5 out of 5 (41 review) |
| Visual Studio Code | Microsoft | Windows, Mac OS, Linux | 4.1 out of 5 (44 reviews) |
Troubleshooting guide for M file complications
While M files can sometimes present difficulties, most problems can be resolved quickly with minor software modifications. Check the tips below to help solve them.
How do I know if my M file is corrupted?
Corrupted M developer files may have one or more of the following symptoms:
- Opening the file results in an error or a failed attempt;
- Poor performance when editing a file in Xcode;
- Opening the file in Sublime Text or other programs causes them to hang or crash;
- Unexpected expansion of the total size of the M file;
- Error messages appear while working with the file;
Why does Sublime Text crash?
The likely cause of Sublime Text crashing is lack of software updates. Install the latest updates available for Sublime HQ Pty products.
Restarting your computer is a crucial troubleshooting measure that can alleviate numerous common problems. Therefore, it is advisable to restart your computer before modifying any settings related to the software.
How to repair a corrupted M file?
Open the corrupted M file in a recovery program and select the "Repair" menu item. Allow the recovery process to complete, which will automatically repair the damaged developer files.