What is MIME type "application/vnd.ms-visio.stencil.macroenabled.main+xml"?

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

The MIME type application/vnd.ms-visio.stencil.macroenabled.main+xml designates a Visio stencil file that supports macros. It uses an XML structure to define shapes and their behaviors.

This file type is essential in Microsoft Visio for organizing collections of pre-designed shapes. It helps users create detailed diagrams with automated features.

Shape Libraries: Stores and organizes reusable diagram elements.
Macro Support: Embeds programmable actions to automate tasks.
XML-based Format: Facilitates integration and easy data exchange with other systems.

The related file is typically saved with the VSSM extension.

This MIME type is used by professionals working with advanced diagramming in Visio. It enhances productivity by offering both powerful visuals and built-in actions.

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Associated file extensions

.vssm

Usage Examples

HTTP Header

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


    Content-Type: application/vnd.ms-visio.stencil.macroenabled.main+xml

HTML

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


    <a href="file.dat" type="application/vnd.ms-visio.stencil.macroenabled.main+xml">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.ms-visio.stencil.macroenabled.main+xml');    
      res.end('Content here');    
    }).listen(3000);

Associated file extensions

.vssm

FAQs

What is the purpose of the application/vnd.ms-visio.stencil.macroenabled.main+xml MIME type?

This MIME type represents a Microsoft Visio Macro-Enabled Stencil, typically associated with the .vssm file extension. Unlike standard stencils, these files contain Visual Basic for Applications (VBA) macros alongside shape definitions to automate complex diagramming tasks.

How do I configure Apache to serve .vssm files correctly?

To ensure browsers and Visio handle the file correctly, add the specific MIME type to your .htaccess or httpd.conf file. Use the directive: AddType application/vnd.ms-visio.stencil.macroenabled.main+xml .vssm.

Are there security risks involved with this file type?

Yes, because this MIME type indicates the presence of macros, the files can potentially execute malicious code. Users should only open .vssm files from trusted sources and may need to adjust their macro security settings in Visio to view the content safely.

Why does my browser download the file as a ZIP archive?

Modern Visio files are XML-based structures compressed into a ZIP package. If the server is misconfigured and sends a generic header like application/zip or application/octet-stream, the browser interprets it as a standard archive. Correcting the server's MIME configuration resolves this issue.

How do I set up IIS to handle this MIME type?

In Internet Information Services (IIS) Manager, navigate to MIME Types and add a new entry. Set the file extension to .vssm and the MIME type to application/vnd.ms-visio.stencil.macroenabled.main+xml to prevent 404 errors during download.

Can I view these files directly in a web browser?

No, web browsers like Chrome or Firefox do not have native support for rendering Visio Stencils. The browser will prompt you to download the file, which must then be opened using Microsoft Visio or a compatible viewer application.

What is the difference between this type and application/vnd.ms-visio.stencil?

The type application/vnd.ms-visio.stencil corresponds to standard stencils (.vssx) which do not support macros. The macroenabled variant (.vssm) is specifically used when VBA automation is required within the stencil library.

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.