/System/Library/CoreServices/SetupAssistantPlugins/QuickLook.flplugin/Contents/MacOS/QuickLook /System/Library/Frameworks/QuickLook.framework/Versions/A/QuickLook When showing files in your app, including the ability to quickly preview a file and its content can be helpful to your users. For example, you may want to allow users to zoom into a photo, play back an audio file, and so on. Use the QuickLook framework to show a preview of common file types in your app that allow basic interactions.