Just to be sure I made no mistake here, I tested in dolphin with a ogg, ogv, webm and mp3 file, and sure enough, dragonplayer do not show in the GUI as an alternative for playing these files.
The lacking mime types in the dragonplayer desktop file is a usability problem for anyone trying to use dragonplayer as their primary video player on the Linux desktop. At the very least, please add audio/ogg, video/ogg, video/webm and audio/mpeg (the ones outputed by 'file --mime-type' for the files) to the desktop file, to ensure these Linux wise commonly used audio and video formats are recognized. -- Happy hacking Petter Reinholdtsen