The Special menu lets you preview images, music, movies, and several types of documents.
With previews you can also view file information, share, copy, and move files, and open them with specific applications. Finally, previews allow you to copy images to the Clipboard, display pictures and PDF files as slideshows, and view the metadata associated with pictures, songs, movies, and PDF files.
Open the Application Wizard pane in System Preferences and click Menus.
Click the Customize Previews button and make sure the ”Show previews in the Special menu” checkbox is selected.