What is MIME type "application/msword"?

A MIME type is a string that tells browsers and other tools how to handle a particular kind of file.

application/msword is the MIME type that signals a file is a Microsoft Word document. It tells browsers, email clients, and operating systems that the file contains rich formatted text meant for a word processor.

When a server sends a file with this MIME type, the receiving application knows to open it with software like Microsoft Word or a compatible editor. This ensures the document’s layout, images, and styling are preserved during viewing or editing.

Files associated with this MIME type include standard document and template formats such as DOCX, DOC, and DOT.

Other related files include specialized templates and macro-enabled documents like DOTX, DOCM, and DOTM. Some older or less common file types—such as style sheets, printer descriptions, and glossary files (STY, GLY, GLX, MCW, PRD, STX) also use this designation. Even some files with non-obvious extensions like VTT might be encountered in certain contexts.

This MIME type is key in file identification and handling. It ensures that when you open or download a file, your system uses the proper software and displays the content as intended. For more on MIME types, visit MIME Types Info.

Associated file extensions

.docx, .vtt, .doc, .sty, .dotx, .prd, .docm, .dot, .wbk, .dotm, .mcw, .stx, .gly, .glx

Usage Examples

HTTP Header

When serving content with this MIME type, set the Content-Type header:


    Content-Type: application/msword

HTML

In HTML, you can specify the MIME type in various elements:


    <a href="file.dat" type="application/msword">Download file</a>

Server-side (Node.js)

Setting the Content-Type header in Node.js:


    const http = require('http');    
    
    http.createServer((req, res) => {    
      res.setHeader('Content-Type', 'application/msword');    
      res.end('Content here');    
    }).listen(3000);

Associated file extensions

.docx, .vtt, .doc, .sty, .dotx, .prd, .docm, .dot, .wbk, .dotm, .mcw, .stx, .gly, .glx

FAQs

Should I use application/msword for .docx files?

Technically, application/msword is the standard MIME type for legacy binary Microsoft Word files (like .doc and .dot). While some servers use it as a catch-all, modern XML-based files like .docx are strictly defined as application/vnd.openxmlformats-officedocument.wordprocessingml.document. However, most operating systems and browsers will still correctly hand off the file to Microsoft Word regardless of which of these two types is used.

Why does my browser download the Word document instead of opening it?

Most web browsers (Chrome, Firefox, Edge) do not have a built-in rendering engine for Microsoft Word formats. When the server sends the application/msword header, the browser interprets this as a signal to download the file so it can be opened by an external desktop application or a specific plugin.

How do I configure Apache to serve Word documents correctly?

You can ensure the correct MIME type is associated with Word extensions by adding a directive to your .htaccess or httpd.conf file. Use the line: AddType application/msword .doc .dot. For modern compatibility, you often see configurations that also map this type to newer extensions in legacy environments, though separating them is best practice.

Are there security risks associated with application/msword?

Yes, files served with this MIME type, specifically .doc and .docm, can contain macros (scripts) that may execute malicious code. It is standard security practice to scan these files for viruses upon download and to open them in "Protected View" if the source is untrusted.

What happens if a Word document is served with the wrong MIME type?

If a server sends a .doc file as text/plain, the browser will attempt to display the raw binary code as text, resulting in a page full of garbled characters. To fix this, the server must be configured to send the correct application/msword header so the browser knows to treat it as a binary document.

What is the relationship between .wbk files and this MIME type?

The .wbk extension indicates a Word Backup file. Since these are essentially copies of the original Word document structure, they share the application/msword MIME type. This ensures that if you download a backup file, your system recognizes it as a Word document and can open it for recovery.

How do I handle application/msword files on mobile devices?

Mobile browsers (iOS Safari, Chrome for Android) generally cannot display application/msword content inline. Users will be prompted to open the file in a compatible app, such as the Microsoft Word mobile app, Google Docs, or Apple Pages.

General FAQ

What is a MIME type?

A MIME (Multipurpose Internet Mail Extensions) type is a standard that indicates the nature and format of a document, file, or assortment of bytes. MIME types are defined and standardized in IETF's RFC 6838.

MIME types are important because they help browsers and servers understand how to process a file. When a browser receives a file from a server, it uses the MIME type to determine how to display or handle the content, whether it's an image to display, a PDF to open in a viewer, or a video to play.

MIME types consist of a type and a subtype, separated by a slash (e.g., text/html, image/jpeg, application/pdf). Some MIME types also include optional parameters.

How do I find the MIME type for a file?

You can check the file extension or use a file identification tool such as file --mime-type on the command line. Many programming languages also provide libraries to detect MIME types.

Why are multiple MIME types listed for one extension?

Different applications and historical conventions may use alternative MIME identifiers for the same kind of file. Showing them all helps ensure compatibility across systems.