How does Chromium pick a MIME-type handler?

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http://askubuntu.com – Chromium doesn't seem to have any obvious MIME-type configuration settings, which strikes me as a little broken. My specific problem is that there are a number of filetypes that Chromium plays in-browser that I'd rather either download or associate with whatever my system-default MIME-type would suggest. Can this be done? And here are two related (unanswered) questions, asking if there's a way to tell Chromium not to play mpeg video and mp3 files. (HowTos)