Legacy Software — this app is no longer actively maintained, but is available for free.

View and inspect files on your Mac

File Viewer allows you to view and inspect files on your Mac. Simply drag and drop any file or folder onto the program window. File Viewer can play common audio and video formats, as well as display many image, Web, and page layout file types. File Viewer also provides hexadecimal, text, and icon views to help you inspect the contents of each file.

Mac File Viewer Screenshot

With File Viewer, you can identify unknown file types and locate programs that open them. The software is linked to the FileInfo.com database, the Central File Extensions Registry, which contains thousands of file extension entries. Each file that is opened in File Viewer is matched to the FileInfo.com database, and File Viewer displays the list of matched file types.