What is MIME type "audio/x-rmf"?

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

The MIME type audio/x-rmf tells software that the file contains encoded audio data. It is a vendor-specific tag used to signal certain playback or editing routines.
Files tagged with this MIME type use the Audio Interchange File Format (AIFF), typically found with extensions AIFF, AIF, and IEF.

It helps multimedia players select the correct audio decoder.
It supports high-quality audio applications.
It marks files for specialized handling by audio software.

The type is not officially registered with IANA. This means support may vary across platforms. More information is available at IANA Media Types.

Associated file extensions

.aiff, .aif, .ief

Usage Examples

HTTP Header

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


    Content-Type: audio/x-rmf

HTML

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


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

Associated file extensions

.aiff, .aif, .ief

FAQs

What is the audio/x-rmf MIME type used for?

The MIME type audio/x-rmf is a vendor-specific identifier used to denote files containing encoded audio data, specifically formatted as Audio Interchange File Format (AIFF). It signals to the operating system or browser that the file requires specific handling, often associated with extensions like .aiff and .aif.

How do I configure Apache to serve audio/x-rmf files?

To serve files with this MIME type on an Apache server, you need to update your configuration or .htaccess file. Add the following line to map the extensions: AddType audio/x-rmf .aiff .aif .ief.

Should I use audio/x-rmf or audio/aiff?

For standard web compatibility, audio/aiff or audio/x-aiff are the preferred MIME types for AIFF files. The audio/x-rmf type is non-standard and should only be used if a specific legacy application or internal system explicitly requires it.

Why won't files with this MIME type play in my browser?

Most modern browsers (Chrome, Firefox, Edge) have limited native support for the AIFF format, regardless of the MIME type used. Furthermore, because audio/x-rmf is not a standard IANA registration, browsers may not recognize it as a playable media type. It is recommended to convert audio to MP3 or AAC for web playback.

How do I add audio/x-rmf support to Nginx?

You can add support by modifying the mime.types file or adding a types block inside your Nginx server configuration. Use the following syntax: types { audio/x-rmf aiff aif ief; }.

What is the relationship between audio/x-rmf and the .ief extension?

While the .ief extension is historically associated with the Image Exchange Format, this specific MIME type definition maps it to audio data. This is an unusual mapping found in specific legacy configurations where the extension was repurposed for audio streams.

Is audio/x-rmf a secure file type?

As with any media file, audio/x-rmf files are generally safe but can theoretically be used to exploit vulnerabilities in media players (buffer overflows). Always ensure your audio processing libraries are up to date and validate files before processing them on a server.

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.