Winmail Reader

Winmail Reader decodes winmail.dat (TNEF) files and reveals all attachments inside. It offers a quick-look style preview, lets you save, copy, print, or share attachments, and handles embedded messages for easy access to content that Outlook may disguise. The extension streamlines working with email data directly in your browser, without needing desktop clients.

Note: Winmail Reader for Mac is also available on the Mac App Store.