These namespaces cause trouble:
For Special, User, MetaBrainz, and Proposal we currently just redirect /doc/ to the original wiki page, which obviously won't have the broken styling. We already do some stripping for links where Image: is concerned, but that neglects File: and doesn't prevent you from just going there directly.
http://codereview.musicbrainz.org/r/2377/ should be satisfactory for what navap and I talked about in-channel. I'm not super pleased about removing all File: links from pages, but this was clearly the original intention and we can revisit it if people end up caring.