MediaPlayer shows error alert when invoked with a BNotification

[humdinger]

This is beta4, 64bit.

Have a media file "Test.avi" on your Desktop and try this in Terminal:

notify --group "Test notify" --title "Movie file" --onClickFile /boot/home/Desktop/Test.avi "Click me to open!"

When you click the notification, MediaPlayer throws this BAlert:

None of the files you wanted to play appear to be media files.
                                                    [OK]

When you click "OK", the file is played alright.