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In Finder one is able to group the files by kind. For example "Movie" kind groups .avi, .mov together. I would like to add additional file extension .mkv to the list of "Movie" kind. Is it possible?

As a bonus, it would also be interesting to know if, similarly, it is possible to add additional "kinds" of files.

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The reason this is happening is answered here,

Unfortunately, there isn't a really fix for the problem.

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Welcome to Ask Different! Whilst this may theoretically answer the question, it would be preferable to include the essential parts of the answer here, and provide the link for reference. – daviesgeek Apr 8 '12 at 5:03

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