mime type

Couldn't find MIME type application/octet-stream (Konquerer/Kdesktop)

This is copied from http://users.pandora.be/Ice9/Linux stuff/Linux_tips.html. I have used the second method as the desktop file appeared to be disfunctional judging from its content and had been created during the time when the error appeared first (that was when I was playing with the File associations section of the control center). KDE returns "Couldn't find MIME type application/octet-stream" at startup and/or Konqueror returns the same error message when launching whatever application.