This is a well-known problem. It actually doesn't (directly) involve your app at all. The operating system will do this with any document when you've configured the document to be opened with an app that doesn't explicitly declare support for it. Since you have declared support for this file type, the most likely explanation is that you haven't declared that support correctly. Document types are specifically for the NSDocument architecture. I don't know anything about your app so I don't know if that usage is appropriate or not. But it sounds like you just need to add some imported type identifiers for those types.
Topic:
Privacy & Security
SubTopic:
General
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