What is MIME type "application/binhex"?

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

application/binhex is a MIME type that indicates a file encoded using the BinHex method. This encoding converts binary data into plain text so it can pass through channels that may distort raw binary content.

It is especially associated with files originally used on Macintosh systems. The method converts all 8-bit data into a 7-bit safe format. This helps prevent corruption when files are sent over email or other text-only networks.

Main purpose: To safely encapsulate binary Mac files into a text format.
Key functionality: Transforms binary data preserving resource forks and metadata.
Practical use: Sending Mac binary files over systems that require 7-bit text.

Files using this MIME type include those with extensions such as HEX, HQX (also seen as application/mac-binhex40), and HCX.

For additional technical details, check the IANA Media Types registry.

Associated file extensions

.hex, .hqx, .hcx

Usage Examples

HTTP Header

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


    Content-Type: application/binhex

HTML

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


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

Associated file extensions

.hex, .hqx, .hcx

FAQs

What is the primary use of application/binhex?

This MIME type is used for files encoded with the BinHex algorithm, designed to convert binary Macintosh files (including resource forks) into 7-bit ASCII text. It ensures files remain intact when transferred through email or legacy servers that only support text.

How do I open a file sent as application/binhex?

You need an archive utility capable of decoding BinHex data, such as The Unarchiver on macOS or StuffIt Expander (available for Windows and Mac). If you try to open it in a standard text editor, you will only see a block of unintelligible alphanumeric characters.

How should I configure Apache to serve .hqx files?

To ensure browsers treat the file as a downloadable archive rather than plain text, add AddType application/mac-binhex40 .hqx to your .htaccess or httpd.conf file. While application/binhex is valid, the specific version application/mac-binhex40 is often preferred for compatibility.

Why does my browser display the BinHex file as text instead of downloading it?

This happens if the server is misconfigured and sends the file with a text/plain MIME type. To fix this, the server administrator must update the MIME configuration to associate the extension (usually .hqx) with application/binhex or application/mac-binhex40.

Is application/binhex the same as application/mac-binhex40?

They are closely related; application/mac-binhex40 specifically denotes BinHex version 4.0, which became the standard for Macintosh file transfer. In modern contexts, application/binhex is often used as a generic alias for the same format.

What common file extensions are associated with this MIME type?

The most prevalent extension is .hqx. However, you may occasionally see .hex or .hcx used for BinHex encoded data.

Is BinHex encoding still relevant for modern web development?

It is largely considered a legacy format, mostly found on sites hosting retro Macintosh software or archives. Modern macOS systems use standard formats like .zip or .dmg, rendering application/binhex unnecessary for current applications.

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.