What is MIME type "application/x-cc3d"?

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

application/x-cc3d is a MIME type for files that define 3D virtual environments using the Virtual Reality Modeling Language. These files contain textual instructions that describe objects, lighting, camera angles, and other elements needed to render interactive three-dimensional scenes.

They are used with files like WRL, VRML, and WRZ. While WRZ files are typically compressed versions, all share the same basic structure for describing 3D content.

Rendering 3D Scenes: Used by 3D viewers and browsers to display virtual environments.
Interactive Simulations: Supports applications in education, training, and simulation software.
Virtual Reality Projects: Provides a basis for simple VR experiences that allow basic interactivity.

These files are created with 3D design tools and are beneficial when transferring scene data between different applications. For further technical details and history, explore the VRML article.

Associated file extensions

.wrl, .vrml, .wrz

Usage Examples

HTTP Header

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


    Content-Type: application/x-cc3d

HTML

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


    <a href="file.dat" type="application/x-cc3d">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-cc3d');    
      res.end('Content here');    
    }).listen(3000);

Associated file extensions

.wrl, .vrml, .wrz

FAQs

What is the purpose of the application/x-cc3d MIME type?

This MIME type identifies files containing 3D scene data formatted in the Virtual Reality Modeling Language (VRML). It tells the browser or operating system that the file, usually with a .wrl or .vrml extension, contains vector graphics and 3D environment definitions.

How do I configure Apache to serve .wrl files as application/x-cc3d?

You can map the file extension to the MIME type by editing your .htaccess or httpd.conf file. Add the line AddType application/x-cc3d .wrl .vrml to ensure the server sends the correct Content-Type header.

Why does my browser download the file instead of showing the 3D model?

Modern web browsers (like Chrome, Firefox, and Edge) do not natively support legacy VRML files without third-party plugins. Because the browser doesn't know how to render application/x-cc3d content internally, it defaults to downloading the file for use in an external viewer.

Is application/x-cc3d the official standard for VRML files?

No, the "x-" prefix indicates it is a non-standard or experimental subtype, often associated with specific software vendors like Corel. The official IANA-registered type for VRML is usually model/vrml, though x-world/x-vrml is also common in legacy systems.

How do I handle .wrz files with this MIME type?

A .wrz file is typically a gzip-compressed VRML file. When serving this, you may need to configure your server to send the application/x-cc3d type along with a Content-Encoding: gzip header so the client knows to decompress the data before rendering.

What software can open files served as application/x-cc3d?

You need specialized 3D modeling software or legacy VRML viewers. Common tools include Cortona3D Viewer, FreeWRL, or older versions of Corel Dream 3D. Converting the file to a modern format like glTF is recommended for web use.

How do I add support for this type in Nginx?

Update your mime.types file or the server configuration block. Add the line application/x-cc3d wrl vrml wrz; to ensure Nginx correctly identifies these extensions when requested by a client.

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.