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While it is clear we cannot retrieve a list of installed applications on iOS, are there any tricks to allow us to determine the list of apps registered for a given file type? That is, the list the user will see in the Open In… menu for that particular file type. canOpenURL only returns a boolean, but ideally it would return us a list of supported installed applications.
I doubt either of your two questions (“determine list of apps for a given file type” or “how to implement ‘open in…'”) is possible in current versions of iOS as users don’t see individual files on the home screens that show apps. Nor can an app do a “open a separate app with this specific file” event (which is something easily doable on a Macintosh with Apple Events).
But these do sound like a great feature requests that you can file with Apple at http://bugreporter.apple.com (which you can log into, if you’re a registered Apple developers). If enough people ask for these features (and the potential “open in…” functionality is indeed a frequently requested feature), Apple will strongly consider including them in future iOS releases.