open .csv files with KWordQuiz via Nautilus seems not to be possible: even with the expanded view of the "open with" dialogue, KWordQuiz is not mentioned.

I tried to change that by editing the /usr/share/applications/kde4/kwordquiz.desktop file by changing the line
Code:
MimeType=application/x-kvtml;
to
Code:
MimeType=application/x-kvtml;application/csv;
but it didn't help.

Has anyone another idea?
thanks!