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Winmail Opener is a simple utility specially designed to open messages in .dat format. This kind of format is usually released by senders who use Microsoft Outlook 97 and 2000.

Key Features

This software allows decoding TNEF files. That is to say, emails delivered with attachments in .dat format. For that, the user only has to import the files from his hard drive to the software and open the contents. Winmail Opener can also recover the contents of encrypted emails attachments in .swf format. Indeed, the application displays the subject as well as the mail's content on its interface so as the user can select the joined files directly. Once the file is decoded, the user can save the text in RTF format. To do this, he has to open the file menu and select "save as RTF format" and define the destination folder.


It supports drag and drop and command line option. Winmail Opener is an executable file that requires no installation. It is downloadable for free and contains no adware.


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Alternative spelling: winmail_opener-1.6.exe, winmail_opener.exe