I have Creative MediaSource Organizer as my default mp3 player, but when I click play in Mp3tag the file won't play. How do I get Mp3tag to play with Creative MediaSource Organizer? TIA.
You can try to add a user-defined tool at Options, Tools for the player and try some command line arguments (maybe "%_path%" - with the quotes - will do the trick).
Just set this tool as the Default tool.