how can i open an external file from an apple mac app?

Mac apps have a file called info.plist that tells the system things about the app. One of the things it declares is the types of files that your app knows how to open. You’ll need to add a CFBundleDocumentTypes entry to your app’s info.plist file.

Search on “Information Property List” in the Xcode help system for the relevant section on delcaring the types of document your app is able to open/edit.

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