A:
Solution 1 (for windows, but repeatable on other platforms):
1. Open Quicktime in Start > Programs > Quicktime
2. Click Edit > Preferences > Quicktime Preferences
3. Click [File Types] Tab and Uncheck MP3 and any other file types you don't want QuickTime to play automatically
4. Click [Browser] Tab
5. Click MIME Settings, and Uncheck MP3 and any other file types you don't want QuickTime to play automatically
6. Click OK Twice
Solution 2 (for windows):
1. Click On Start > Set Program Access And Defaults
2. Click Custom and Scroll Down to Default Media Player
3. Choose a Default Media Player like Winamp
4. Press OK
Solution 3:
Uninstall QuickTime!
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