What is MIME type "application/vnd.lotus-freelance"?

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

application/vnd.lotus-freelance is a MIME type for files created by the Lotus Freelance suite. It designates files containing presentation data and master graphic information.

Files using this MIME type include those for Lotus Freelance Show and Lotus Freelance Smartmaster Graphics. For example, the presentation data files come as PRZ and PRE, while design layouts are stored in MAS files.

Main use: Distinguish Lotus Freelance presentation documents.
Functionality: Embed slide layouts, text, graphics, and design templates.
Legacy support: Enable older Lotus software to recognize and handle its native file formats.

The binary format encapsulates design and content to preserve the look and structure of a presentation. It ensures that when these files are shared via email or web download, systems can identify them as Lotus Freelance documents.

For further details on MIME type registrations, see the IANA entry.

Associated file extensions

.prz, .pre, .mas

Usage Examples

HTTP Header

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


    Content-Type: application/vnd.lotus-freelance

HTML

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


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

Associated file extensions

.prz, .pre, .mas

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.