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Our iPad app associates files with a certain extension (.por) with itself. When it's installed, if users download one of those files in Safari, they're given the usual choice of which application to open it with. They choose our app (it's the only option listed) and the app opens with the new file displayed appropriately. Everything works just fine.

However, if they email that same file to themselves, and try to open the file from the standard iPad mail app, something different happens. The same list of "which app would you like to open it with?" appears with just our app in it, but choosing our app in the list does nothing at all, even if it's already running. The app does not open.

Opening files from email works fine for most users, and for me personally on our test iPads, just not for a few of these users. Restarting the iPad and updating the app doesn't seem to make a difference.

What could cause something like this to happen? Since our app doesn't open, I'm not sure how I could even debug this. Has anyone experienced this issue before?

Colen
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  • Do you know if they're using a specific generation of iPad, or possibly of iOS? – thegrinner Jun 03 '13 at 14:52
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    Are you following the steps here: http://stackoverflow.com/questions/2774343/how-do-i-associate-file-types-with-an-iphone-application/2781290#2781290 ? That's what I use for custom file types, and they've always worked right in Mail. – Brad Larson Jun 03 '13 at 14:56
  • @thegrinner we require iOS 6.1, not sure about the iPad versions. – Colen Jun 03 '13 at 15:46
  • @BradLarson Everything listed there is defined by our CFBundleDocumentTypes / UTExportedTypeDeclarations entries, other than having a MIME type. :( – Colen Jun 03 '13 at 15:47
  • @Colen - What happens if you define a proprietary MIME type for it and use that? – Brad Larson Jun 03 '13 at 18:02
  • @BradLarson I guess I could just make one up and try it, I don't see why that would cause this problem though - mail knows it's one of our files, just nothing happens when you try to open it... – Colen Jun 03 '13 at 18:15

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