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For iOS dev, as my application can know, for a certain type of file that another application can open

on iOS devices, the Mail application offers the option "Open in ..." for attachments. The applications listed have registered their CFBundleDocumentTypes with the OS. I am wondering how my application can know, for a certain type of file, which other application can open?

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There is no public API for this, however you can open the sheet that Mail.app shows using the UIDocumentInteractionController class. It does not give you access to the names of applications that can process the document, but is probably better than nothing.

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