I just noticed the gnuwin32/file/magic is over a half meg and most of the entries don't have associated mime types. Can we use Apache's magic file? (around 30K)
Otherwise, we should drop the finfo feature in Piwik::serveStaticFile() and require tht content type be set explicitly by the caller.
(In ) fixes #1683 - removed the magic database to reduce bloat; content type is a mandatory parameter to Piwik::serveStaticFile()