However, this created trouble for non-embedded .m3u files. I run an on-demand site that uses Apache::MP3, a module that creates .m3u files on the fly to stream mp3s. Normally the .m3u files are downloaded and opened using a default appliction, iTunes, WinAmp, RealPlayer, whatever. After registering QuickTime as the handler of the mime type however, the plugin attempted to play these files within the browser. Unfortunately it failed to do so. I had the same result attempting to listen to an Internet radio station, Radio Paradise. Many Internet radio streams use .pls files instead of .m3u so the mime type change doesn't affect them but for me it's a killer. Ideally embedded .m3u files would be handled by a plugin and the rest by a helper app.