What is MIME type "application/x-msclip"?

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

application/x-msclip is a MIME type used by Microsoft for clipboard data files. It works in the Windows environment to hold the contents that you copy from one place and paste elsewhere. The file associated with this type uses the extension CLP. Main purposes and functionalities:

Clipboard Data Storage: It saves data copied to the clipboard, including text, images, and formatting details.
Internal Use: Applications on Windows use this format to manage copy‑and‑paste operations.
Non-Standard Format: The MIME type uses an “x‑” prefix, which indicates it is a non-standard, Microsoft‑specific format.

Functionality:
An application/x-msclip file captures a snapshot of your clipboard contents. It preserves multiple data types in one file structure and is essential for transferring that data internally within Windows applications. This type of file is rarely opened or edited directly by users, but it plays a key role in maintaining efficient clipboard operations.
For more information on MIME types, see MIME on Wikipedia.

Associated file extensions

.clp

Usage Examples

HTTP Header

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


    Content-Type: application/x-msclip

HTML

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


    <a href="file.dat" type="application/x-msclip">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/x-msclip');    
      res.end('Content here');    
    }).listen(3000);

Associated file extensions

.clp

FAQs

What type of file is associated with application/x-msclip?

This MIME type is strictly associated with the .clp file extension. These files contain binary Windows Clipboard data, allowing users to save the contents of their clipboard to a disk file for later use. For more details on the extension, visit clp.

How do I open a file served as application/x-msclip?

You need the legacy Windows Clipboard Viewer (clipbrd.exe) or a specialized third-party utility to view these files. Modern web browsers cannot display this content natively and will prompt you to download the file instead.

How do I configure Apache to serve .clp files correctly?

To ensure your Apache server sends the correct headers for Windows Clipboard files, add the following line to your .htaccess file or main configuration: AddType application/x-msclip .clp. This helps client browsers identify the proprietary format.

Is application/x-msclip a standard IANA MIME type?

No, the x- prefix explicitly indicates that this is a non-standard or proprietary type. It was defined by Microsoft for use within the Windows ecosystem and is not part of the standard web media types found on mime-type.com.

Can I use application/x-msclip on Linux or macOS?

Generally, no. This MIME type represents a binary structure specific to the Windows API. While you can store the file on other operating systems, opening or interpreting the data usually requires Windows or a translation tool specifically designed to parse Microsoft clipboard structures.

Why does my browser download the file instead of displaying it?

Browsers like Chrome, Firefox, and Edge do not have built-in rendering engines for application/x-msclip. When the server sends this Content-Type, the browser treats it as an unknown binary stream and defaults to the Save As dialog to ensure data preservation.

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.