This site simply hosts icons for lots of filetypes that you can use and link to. You can use a file extention like
/html, a filename like
/movie.avi, a mimetype like
/application/pdfand/or choose from a specific set like
/neu/htmlor even combine them like
/neu/image/png. You can also use the
?size=16to get a consistent size of icons, and the
?default=...to force a default instead of an HTTP 404.