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.MSIX·File Extension

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

Data & Textapplication/msix

Quick facts

Extension.msix

File typeMSIX Data & Text

MIME typeapplication/msix

CategoryData & Text

Charset—

CompressibleNo

What is .msix

What is a .msix file?

A .msix file is a MSIX 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/msix, and it is marked as non-compressible. When serving .msix over HTTP, set the Content-Type header as shown in Developer info below.

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

How to open .msix files

Use VS Code or Notepad++ to open and edit .msix 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/msix

Common software that reads/writes .msix:

VS CodeNotepad++Sublime Textjq

Relation chain

.msixextension of

format

MSIX Data & Textserved as

mime type

application/msixsent 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 .msix 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 .msix files

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

Frequently asked questions

What programs can open .msix 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 .msix file?

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

What is the relationship between .msix and the application/msix MIME type?

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

Sources & standards

Updated 2026-09-13

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