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.WKS·File Extension

WKS Document — A .wks file is a WKS Document. It is a document format used for word processing, spreadsheets, presentations or ebooks.

Documentapplication/vnd.ms-works

Quick facts

Extension.wks

File typeWKS Document

MIME typeapplication/vnd.ms-works

CategoryDocument

Charset—

Compressible—

What is .wks

What is a .wks file?

A .wks file is a WKS Document. It is a document format used for word processing, spreadsheets, presentations or ebooks.

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

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

How to open .wks files

Use Microsoft 365 or LibreOffice to open and edit .wks 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.ms-works

Common software that reads/writes .wks:

Microsoft 365LibreOfficeAdobe AcrobatGoogle Docs

Relation chain

.wksextension of

format

WKS Documentserved as

mime type

application/vnd.ms-workssent via header

http header

Related extensions

Related MIME types

application/vnd.ms-works

.wps .wks .wcm

Common uses

Reports and letters
Spreadsheets and budgets
Presentations
Ebooks

How to edit .wks files

Open the file with Microsoft 365, make your changes and save.
Most editors preserve the original formatting and encoding — avoid changing the charset.

How to create .wks files

Create a new file and save it with the .wks extension, or export this format from Microsoft 365.

Frequently asked questions

What programs can open .wks files?

Common options include Microsoft 365, LibreOffice, Adobe Acrobat. You can also open many of these files with built-in viewers or a browser.

How do I create a .wks file?

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

What is the relationship between .wks and the application/vnd.ms-works MIME type?

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

Sources & standards

Updated 2026-09-13

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