Is it possible to change the file Kind, e.g. mkv to video and not document?

Is it possible to change the file Kind, e.g. mkv to video and not document?

I can't find where I can change this in Finder or OSX. Is this really hardoded in the OS? Get Info gives me no options, but that is where I set the default apps for file kinds (types).

I hope this is possible because I have lot of document kinds and the arrange by kind view in Finder is thus not very useful.

Thanks in advance.