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在发布将在 OS X 上创建新扩展类型的应用程序之前,我是否需要向 Apple 注册新的扩展类型?
不,不需要注册扩展。
作为后续,Apple Developer Connection (ADC) 网站的常见问题解答中提供了更多信息:
http://developer.apple.com/faq/datatype.html