MSM Data & Text — A .msm file is a MSM Data & Text. It is a text-based data format widely used for configuration files, data interchange and API payloads.
Quick facts
What is .msm
A .msm file is a MSM 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/octet-stream, and it is marked as compressible. When serving .msm over HTTP, set the Content-Type header as shown in Developer info below.
Related entities: it maps to application/octet-stream — and is delivered over HTTP via the Content-Type header.
How to open .msm files
Developer info
When served over HTTP, responses should set the following header:
Content-Type: application/octet-stream
Common software that reads/writes .msm:
Relation chain
Related extensions
Related MIME types
Common uses
How to edit .msm files
How to create .msm files
Frequently asked questions
Common options include VS Code, Notepad++, Sublime Text. You can also open many of these files with built-in viewers or a browser.
Create a new file in any text editor or the app that owns the format and save it with the .msm extension.
application/octet-stream is the media type identifier used for .msm files during network transfer (for example in the HTTP Content-Type header).
Sources & standards
Updated 2026-09-13
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