This utililty allows you to define file formats that are not defined in web browsers. This enables the browser to display or output files that are not in HTML format, just like it displays simple text files, .gif graphics files and PostScript files.
To add a definition for your own file format, do the following:
Begin file extension with a dot. The MIME type must comply with MIME type specifications, e.g.: text/rtf or video/mpeg.