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.MFM·File Extension

MFM Data & Text — A .mfm file is a MFM Data & Text. It is a text-based data format widely used for configuration files, data interchange and API payloads.

Data & Textapplication/vnd.mfmp

Quick facts

Extension.mfm

File typeMFM Data & Text

MIME typeapplication/vnd.mfmp

CategoryData & Text

Charset—

Compressible—

What is .mfm

What is a .mfm file?

A .mfm file is a MFM Data & Text. It is a text-based data format widely used for configuration files, data interchange and API payloads.

In the mime-db registry it maps to application/vnd.mfmp. When serving .mfm over HTTP, set the Content-Type header as shown in Developer info below.

Related entities: it maps to application/vnd.mfmp — and is delivered over HTTP via the Content-Type header.

How to open .mfm files

Use VS Code or Notepad++ to open and edit .mfm files.
Any text editor (Notepad, VS Code) can inspect the raw content as text.

Developer info

When served over HTTP, responses should set the following header:

Content-Type: application/vnd.mfmp

Common software that reads/writes .mfm:

VS CodeNotepad++Sublime Textjq

Relation chain

.mfmextension of

format

MFM Data & Textserved as

mime type

application/vnd.mfmpsent via header

http header

Related extensions

Related MIME types

Common uses

Configuration files
Data interchange between systems
API request and response payloads
Logs and data exports

How to edit .mfm files

Open the file with VS Code, make your changes and save.
Most editors preserve the original formatting and encoding — avoid changing the charset.

How to create .mfm files

Create a new file and save it with the .mfm extension, or export this format from VS Code.

Frequently asked questions

What programs can open .mfm files?

Common options include VS Code, Notepad++, Sublime Text. You can also open many of these files with built-in viewers or a browser.

How do I create a .mfm file?

Create a new file in any text editor or the app that owns the format and save it with the .mfm extension.

What is the relationship between .mfm and the application/vnd.mfmp MIME type?

application/vnd.mfmp is the media type identifier used for .mfm files during network transfer (for example in the HTTP Content-Type header).

Sources & standards

Updated 2026-09-13

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