Winmail Opener: How to read TNEF-encoded email messages

Microsoft Outlook and Exchange Server often store and transport messages in TNEF, a proprietary format Microsoft uses to encapsulate email messages. A non-Microsoft email client that doesn't know how to interpret TNEF will simply display the message as a plaintext email with WINMAIL.DAT listed as an attachment -- which means that any attached data will be unreadable. One way around this issue is to use a program like Winmail Opener, a free utility that decodes and reads TNEF.

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