[Content_Type] sets the MIME type of the current HTTP response. Accepts a single parameter, the MIME type which should be sent to the client Web browser.

The MIME type should be a valid type as defined by the World Wide Web Consortium

Common examples include: 'text/html' for standard HTML documents, 'text/xml' for XML documents, 'image/gif' for GIF images, and 'image/jpeg' for JPEG images.

Since this tag modifies the HTTP response header it should be used after any [Header] ... [/Header] tags contained in a format file.