The Preview pane
Use the Preview pane to see the contents of supported file types. The Preview panes content is updated based on the file that is currently selected within the file listing. If the Preview pane encounters a file type that is not supported, then a file icon that represents the file type is displayed instead. The types of files that the Preview pane supports are:
This mode displays a thumbnail of the original picture. If the picture resides on a remote server, then a thumbnail is downloaded instead of the entire file which helps to limit valuable network resources.
Audio / Video
This mode allows you to play the audio or video file within an embedded media player.
Only local audio or video files can be previewed. The media player only plays certain file types and its functionality is outside the scope of this document.