I converted this some time ago from Apple Source.
I converted it to MDX, but I’ll recommend the other Oxford English-Italian-English Dictionary (by Legoprint), that we have. Reason: 141.854 words for Apple’s dictionary, 547.801 for the other (Legoprint). There is another (Italian-English) dictionary too.
More Italian-English and English-Italian dictionaries. Monolingual Italian-Italian dictionaries.
For more Italian dictionaries you can search here or here.
Bonus: the second (older) Oxford Paravia dictionary from Apple’s site.