/System/Library/Frameworks/QuickLookUI.framework/Versions/A/QuickLookUI 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 Quick Look framework to show a preview of common file types in your macOS app that allow basic interactions. Quick Look can generate previews for common file types.