Carl-Adam Brengesjö wrote:

And all other suggestions for deciding filetype have been so far to have it being based on filextensions, wich is not the same!

The best suggestion so far is to leave the current system of file types (where a type is some set of file extensions) in place.

Again: what does using MIME types gain us over file extensions?

Sure,  we could basically recreate/port the unix way of guessing mime type, but... why?  It gains us nothing, and it adds complexity and uncertainty.  Not all will handle MIME guessing the same, so you've just introduced interoperability issues.

- Todd