Dropping Files onto Dock Icon in Cocoa

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If you’ve set up your Info.plist’s CFBundleDocumentTypes array properly (either ‘LSItemContentTypes’ or ‘CFBundleTypeExtensions’), then you just need to set up an NSApplication delegate and implement the delegate method, application:openFile:.

If you’re expecting multiple files to be dropped at once, implement application:openFiles:.

For promised files (NSFilesPromisePboardType/kPasteboardTypeFileURLPromise) see Dropping promised files on to application icon in Dock.

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