Last thursday I’ve checked into the cvs tree of Atom.NET a comprehensive list that I’ve assembled containing quite every media type out there. It’s plain text divided into two columns separated with space (easily parseable). The first column is the mime type (eg. text/plain) and the second one is the url of the specification of the mime type (eg. http://www.rfc-editor.org/rfc/rfc3676.txt). So, here you are: mediatypes.txt