lookup> .msl

.MSL·File Extension

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

Data & Textapplication/vnd.mobius.msl

Quick facts

Extension.msl

File typeMSL Data & Text

MIME typeapplication/vnd.mobius.msl

CategoryData & Text

Charset—

Compressible—

What is .msl

What is a .msl file?

A .msl file is a MSL 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.mobius.msl. When serving .msl over HTTP, set the Content-Type header as shown in Developer info below.

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

How to open .msl files

Use VS Code or Notepad++ to open and edit .msl 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.mobius.msl

Common software that reads/writes .msl:

VS CodeNotepad++Sublime Textjq

Relation chain

.mslextension of

format

MSL Data & Textserved as

mime type

application/vnd.mobius.mslsent via header

http header

Related extensions

Related MIME types

application/vnd.mobius.msl

.msl

Common uses

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

How to edit .msl 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 .msl files

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

Frequently asked questions

What programs can open .msl 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 .msl file?

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

What is the relationship between .msl and the application/vnd.mobius.msl MIME type?

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

Sources & standards

Updated 2026-09-13

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