Exported UTI for package/bundle

Question

My Cocoa document-based app opens and writes custom packages/bundles.

Is this considered a proprietary format that needs to be exported via Exported UTIs (UTExportedTypeDeclarations)?

If so, what should be the values for:

• Conforms To (UTTypeConformsTo)
• Mime Types (public.mime-type)
• Pboard Types (com.apple.nspboard-type)
• OS Types (com.apple.ostype)

Finally, does the Exported UTI identifier (UTTypeIdentifier) need to be the same value than the Document Type identifier (LSItemContentTypes)?

Answer 1

Trial-and-error findings:

Is this considered a proprietary format that needs to be exported via Exported UTIs (UTExportedTypeDeclarations)?

Yes. While I couldn't find any explicit mention of this in the documentation, exporting the type was necessary for Finder to treat the directories as packages.

• Conforms To (UTTypeConformsTo)

com.apple.package (source)

• Mime Types (public.mime-type)

Empty. Directories don't have a Mime Type?

• Pboard Types (com.apple.nspboard-type)

Empty. Pboard Types are deprecated?

• OS Types (com.apple.ostype)

No clue.

Finally, does the Exported UTI identifier (UTTypeIdentifier) need to be the same value than the Document Type identifier (LSItemContentTypes)?

Yes, but I couldn't find any explicit mention of this in the documentation.