In my wiki, I needed to upload some *.jude files. They are UML diagrams I need for my project.
*.jude files, are, in fact, ZIP files with another extension. Since MediaWiki verifies MIME types for uploaded files, I need to either disable $wgVerifyMimeType (which I don't want to do) or add jude to application/zip line at mime.types (which is what I did).
So, I'm proposing this as an enhancement for future versions.