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

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

application/x-arj identifies files compressed with the ARJ method. It bundles several files into one compressed archive. The related file is ARJ.

This MIME type is used to decrease file sizes and group files together. It helps when sending, storing, or backing up data.

ARJ archives were popular in older DOS systems. Modern computers need specific tools to open these files.
For more details, see Wikipedia.

Associated file extensions

.arj

Usage Examples

HTTP Header

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


    Content-Type: application/x-arj

HTML

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


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

Associated file extensions

.arj

FAQs

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

application/x-arj represents the ARJ Compressed Archive format. It was widely used in the MS-DOS era to compress files and split large archives across multiple floppy disks. It functions similarly to the modern application/zip format but uses the .arj extension.

How do I open an ARJ file on Windows or macOS?

Modern operating systems do not include native support for ARJ files. To open or extract them, you must install third-party archiving software such as 7-Zip, WinRAR, or The Unarchiver.

How do I configure Apache to serve ARJ files?

To ensure Apache serves .arj files with the correct MIME type, add the following directive to your .htaccess file or main configuration: AddType application/x-arj .arj. This prevents browsers from misinterpreting the binary data as text.

What is the correct Nginx configuration for ARJ files?

In Nginx, you should add the MIME type mapping inside your http or server block if it is not already in mime.types. Use the syntax: types { application/x-arj arj; } and reload the server.

Why does the MIME type start with "x-"?

The x- prefix indicates that application/x-arj is a non-standard or experimental type not officially registered with the IANA. While it is the widely accepted standard for ARJ files, it predates modern standardization processes.

Can web browsers display application/x-arj files directly?

No, web browsers cannot render or preview ARJ archives. When a user navigates to a file with this MIME type, the browser will automatically trigger a "Save As" dialog to download the file.

Are application/x-arj files safe to open?

Like any archive format, an ARJ file can contain malware or viruses inside the compressed data. You should always scan files with antivirus software before extracting them, especially if they originate from an unknown source.

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.