Opening files by mimetype instead of by file extension

[Albert Astals Cid]

As far as I can see QFileDialog only supports listing by file extension.

On the other hand it seems in GTK+ land you can get an open file dialog listing by mimetype, so I've got one bug about "you're worse than XXX because you can't do this"

Is there something we could do at the KDE Frameworks level to support this feature? 

Or should this be done in Qt?

Cheers,
  Albert