Which MIME types are related to file extension ".mm"?
The .mm file extension is associated with 7 MIME types:
application/freemind, application/x-freemind, text/x-objcsrc, text/x-objectivec, text/xml, application/octet-stream, text/x-objective-c++.
A MIME type is a string that tells browsers and other tools how to handle a particular kind of file.
About .mm Files
MM files are versatile and can serve multiple purposes. They may hold mind-mapping data, source code, structured XML, or even financial records.
- FreeMind Mind Maps: These files use the MIME types application/freemind and application/x-freemind and store hierarchical data in an XML format. They are ideal for brainstorming and planning, and you can open them with FreeMind or similar mind-mapping software.
- Objective-C++ Source Code: When used in development, .MM files are often text files marked by the MIME types text/x-objcsrc, text/x-objectivec, or text/x-objective-c++. Developers typically edit these files in an IDE like Xcode, especially when mixing Objective-C with C++ code.
- XML Documents: Some .MM files adopt the text/xml MIME type, indicating they contain structured XML data that can be edited with simple text or XML editors.
- Money Matters Data: A few .MM files are associated with the application/octet-stream MIME type. These serve as data files for Money Matters (v4), a financial or accounting application.
Relationship between file extension and MIME type
A file extension is a suffix at the end of a filename that indicates what type of file it is. File extensions help both users and operating systems identify what application should be used to open the file.
File extensions are typically separated from the filename by a period (dot) and consist of 2-4 characters, though they can be longer. For example, in the filename "document.pdf", ".pdf" is the file extension.
File extensions are closely related to MIME types, as they both serve to identify the format of a file. However, while MIME types are used primarily by web browsers and servers, file extensions are used by operating systems and applications.
Associated MIME types
application/freemind, application/x-freemind, text/x-objcsrc, text/x-objectivec, text/xml, application/octet-stream, text/x-objective-c++
FAQs
What is an .mm file and how do I open it?
Most commonly, an .mm file is a mind map created by FreeMind, an open-source mind-mapping tool. You can open these files using FreeMind or the compatible fork, Freeplane, on Windows, macOS, and Linux. If the file is not a diagram, it may be Objective-C++ source code used by Apple developers.
Why does my .mm file look like computer code?
If your file contains programming text, it is likely an Objective-C++ source file used in macOS or iOS development. These files combine C++ and Objective-C syntax and typically utilize the MIME type text/x-objective-c++ or text/x-objcsrc. You should open these files using an IDE like Xcode or a code editor like VS Code.
Can I convert a FreeMind .mm file to PDF or an image?
Yes, you can export your mind map to other formats directly within the FreeMind or Freeplane application. Go to the File > Export menu to save your diagram as a PDF, PNG, JPEG, or HTML file for easier sharing with users who do not have the software installed.
Are .mm files text-based or binary?
Both FreeMind maps and Objective-C++ source code are text-based. FreeMind files store data in structured XML (often associated with text/xml), while source code files are plain text. This means you can technically view the raw contents of both types using a simple editor like Notepad or TextEdit, though the XML structure may be difficult to read manually.
What is the correct MIME type for serving FreeMind files?
When configuring a web server to handle FreeMind maps, the standard MIME type is usually application/x-freemind. You might also see application/freemind used in some configurations. For more details on configuring these types, see the application/x-freemind entry.
Is an .mm file compatible with MindManager?
Not natively; MindManager typically uses the .mmap extension. However, many mind-mapping tools, including MindManager and XMind, offer import features that allow them to read and convert FreeMind .mm files, though some formatting might be lost during the process.
What is the Money Matters .mm file format?
Rarely, an .mm file may be a data file for the older financial software Money Matters. These files are often binary and use the generic MIME type application/octet-stream. If FreeMind or a text editor cannot open your file, it may belong to this legacy financial application.
General FAQ
What is a MIME type?
A MIME (Multipurpose Internet Mail Extensions) type is a standard that indicates the nature and format of a document, file, or assortment of bytes. MIME types are defined and standardized in IETF's RFC 6838.
MIME types are important because they help browsers and servers understand how to process a file. When a browser receives a file from a server, it uses the MIME type to determine how to display or handle the content, whether it's an image to display, a PDF to open in a viewer, or a video to play.
MIME types consist of a type and a subtype, separated by a slash (e.g., text/html, image/jpeg, application/pdf). Some MIME types also include optional parameters.
How do I find the MIME type for a file?
You can check the file extension or use a file identification tool such as file --mime-type on the command line. Many programming languages also provide libraries to detect MIME types.
Why can one extension have multiple MIME types?
Different programs and historical usage may assign various MIME identifiers to the same file format. Listing them together helps maintain compatibility across tools.