When previews are enabled, the Special menu lets you quickly view information about files and applications.
Select the file or application in the Special menu to view kind, UTI, file size, creation date, and modification date. In addition to that, image size is displayed for pictures, duration for songs, resolution and duration for movies, and version and copyright notice for applications.
Display the More Info submenu for additional information: you can view keywords, when a file was last opened, and, in case it was downloaded or received as an attachment, where it was obtained from (URL, sender’s email address, message subject, ... ).