I have started to create a save tool and mio editor/viewer for WarioWare D.I.Y. in java. Currently, it can open wii and ds saves to extract mio files, edit game/record/comic/manga metadata, show the preview picture for games, play records, view comics/mangas and the next version will be able to unlock all games/records/comics/achievements for ds saves. I have written the back-end code for the music editor, but I really cannot come up with a good interface for it, plus my current interface...
WarioWare D.I.Y. Editor
WarioWare D.I.Y. Editor