Register new OS X file type by extension & associate with Cocoa app

Question

OK, so here's the deal :

• I've got a new app which I want to associate with a new file type - let's say .xyz
• .xyz files - if that matters at all - is a Package file.

Now, here's how the filetype-specific portion of my info.plist looks like :

CFBundleDocumentTypes = (
        {   
            CFBundleTypeExtensions = ( "xyz" );
            CFBundleTypeIconFile = "xyz-icon";
            CFBundleTypeName = "XYZ file";
            CFBundleTypeRole = "Viewer";
            LSTypeIsPackage = "1";
        }
    );

However, the .xyz package files are still shown as folders and NOT as a single file ("package"). What am I doing wrong?

---

HINT : I've managed to do that in the past, but I simply cannot remember if I'm missing something. Perhaps the system has to be restarted? I have no idea...

Answer 1

If you found this stackoverflow page because LSTypeIsPackage isn't working for you, it might be because you're using LSItemContentTypes to declare your document type. The use of LSItemContentTypes makes the system ignore LSTypeIsPackage (which isn't the case in this stackoverflow question).

If you're using LSItemContentTypes, you need to make your exported type conform to com.apple.package. Example:

CFBundleDocumentTypes
  LSItemContentTypes
    Item 0 = com.example.xyz
  CFBundleTypeExtensions
    Item 0 = xyz
  CFBundleTypeRole = Editor
  etc.

UTExportedTypeDeclarations
  Item 0
    UTTypeIdentifier = com.example.xyz
    UTTypeConformsTo
      Item 0 = public.data // or whatever
      Item 1 = com.apple.package          <-------------
    UTTypeDescription = XYZ Document
    etc.