Winmail Dat Opener is a free iPhone app developed by ElevenThirteen LLC that allows users to open and view attachments in winmail.dat files. If you've ever received an email with a winmail.dat file attached that you couldn't open, this app is here to help.

The winmail.dat file often appears when messages are sent from the Microsoft Outlook mail program or a Microsoft Exchange server and your own mail program isn't set up to handle mail in the Microsoft Outlook Rich Text Format. With Winmail Dat Opener, you can easily access and view the important attachments within these files.

The app also offers a PRO account subscription option, available for 1-week, 1-month, or one year. The subscription automatically renews unless auto-renew is turned off at least 24 hours before the end of the current period. Payment will be charged to your iTunes Account at confirmation of purchase, and subscriptions can be managed and auto-renewal turned off in your Account Settings.

With Winmail Dat Opener, you can finally open and view winmail.dat attachments hassle-free on your iPhone.