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

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

The MIME type application/x-photoshop flags files created for Adobe Photoshop. It tells your system that these files require specialized handling.

Files with this type are used to store Photoshop-specific data. For example, a Photoshop Transfer Function file (ATF) contains color and tone data. An Adobe Action file (ATN) saves a sequence of commands for batch processing.

Specialized Processing: Indicates content meant for Photoshop.
Automation: Supports recorded actions to automate tasks.
Color Management: Handles data for accurate color and tone adjustments.

This MIME type is tailored for Photoshop’s unique functions and ensures files open with the right application for precise editing.

Associated file extensions

.atf, .atn

Usage Examples

HTTP Header

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


    Content-Type: application/x-photoshop

HTML

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


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

Associated file extensions

.atf, .atn

FAQs

What is the application/x-photoshop MIME type used for?

This MIME type is used for auxiliary Adobe Photoshop files, primarily Adobe Action files (ATN) and Transfer Functions (ATF). It signals to the operating system that the file contains proprietary binary data for automation or color management that must be processed by Photoshop.

Can web browsers display application/x-photoshop files?

No, web browsers like Chrome, Firefox, and Edge cannot render these files natively. Because they contain specialized application data rather than standard image formats (like JPG or PNG), browsers will force a download action when a user clicks a link to an .atn or .atf file.

How do I configure Apache to serve ATN files correctly?

To ensure browsers handle the file as a download rather than text, add the type definition to your .htaccess file or httpd configuration. Use the directive: AddType application/x-photoshop .atn .atf.

Is application/x-photoshop the same as the standard PSD MIME type?

Not exactly; while it is sometimes used as a legacy identifier for PSDs, the official standard for Photoshop Documents is image/vnd.adobe.photoshop. The application/x-photoshop type is more frequently encountered with non-image data files like Actions or settings files.

How do I fix Nginx treating ATN files as text?

If Nginx serves these files as text/plain, users may see garbled code in their browser. To fix this, edit your mime.types file (usually in /etc/nginx/) and add the line: application/x-photoshop atn atf;, then reload the server.

Are files with this MIME type safe to open?

Generally yes, but Adobe Action (.atn) files contain sequences of recorded commands. While they are not executable binaries, you should only download and import actions from trusted sources to ensure they perform the expected image processing tasks without errors.

How do I open an application/x-photoshop file?

You need Adobe Photoshop installed on your system. Unlike standard images, you often cannot just double-click these files; instead, you may need to import them via specific panels within Photoshop, such as the Actions Panel for .atn files.

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.