Error in knights.desktop

Hi, On SUSE 9.3 I see this everytime, when SuSEconfig runs:

Executing /sbin/conf.d/SuSEconfig.desktop-file-utils... File '/opt/kde3/share/applications/kde/knights.desktop' contains invalid MIME type 'application/x-chess-pgn,Application' that contains invalid characters

Is there a known way please to fix this and to get rid of the error message?! Thanks, Pelibali