What is MIME type "application/x-epoc-opo"?

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

application/x-epoc-opo is the MIME type for files that contain compiled code from the OPL language. These files are used on systems running the legacy EPOC operating system.

Files of this type are created when developers compile source code written in OPL (Open Programming Language) into object modules. They help the operating system quickly execute pre-compiled routines and integrate application components.

These modules are typically stored with the file extension OPO.

They are essential for building and executing applications on devices that use the EPOC system.
They improve performance by shifting processing work from runtime to compile time.
They maintain compatibility with legacy application frameworks on older mobile and handheld devices.

Additional details on the operating system that uses these modules can be found at EPOC Operating System.

Associated file extensions

.opo

Usage Examples

HTTP Header

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


    Content-Type: application/x-epoc-opo

HTML

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


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

Associated file extensions

.opo

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.