How to Open a Winmail Attachment

A Winmail file, an attachment connected to Microsoft Outlook, contains a variety of components including files and styling information related to the specific email. The Winmail attachment's file format is “winmail.dat,” but may also be formatted as “ATT001.dat.” The attachment cannot be opened directly—a converter must be used. Winmail attachment converters not only extract the individual files, but also allow you to save the attachment's files for use in other programs including Microsoft Word, PowerPoint and Excel.

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Winmail attachments can be opened.

Using Winmaildat.com

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Open your computer's Internet browser.

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See Resources for the link to the Winmaildat website. Click on the link--the Winmaildat website will open.

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Click “Browse.” Navigate to the directory containing the Winmail attachment you want to open. Double-click on the Winmail attachment to open it.

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Click “Send.” The Winmaildat website will convert the file and present the file's contents on a results page.

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Right-click on the converted file(s). Select “Save As” to save the file(s) to your computer.

Downloading and Using Winmail Reader

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Open your computer's Internet browser.

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See Resources for the link to the Winmail Reader setup program. Click on the link--the “Opening winmail-reader-setup.exe” dialog box will appear.

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Click “Save As,” “Save File” or “OK” to save the Winmail Reader's setup file to your computer.

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Double-click on the “winmail-reader-setup.exe” file to open the setup program.

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Select the language you want the program installed in. Click “OK.” The “Setup–Winmail Reader” dialog box will open.

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Click “Next.” Click on the circle next to the wording “I accept the agreement.”

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Click “Next” to continue the setup program's installation.

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Click “Next.” Click on the check box next to the wording “Create a Desktop Icon” to place a shortcut to the program on your computer's “Desktop.”

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Click “Next.” Click “Install” and “Finish.” The Winmail Reader program will open automatically.

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Click on the check box next to the wording “Associate .dat files with this application” to use this program as your default Winmail attachment viewer. Click “OK.”

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Click on the “Open winmail.dat” icon in the upper left-hand corner of the Winmail Reader dialog box.

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Navigate to the directory containing the Winmail attachment you want to open. Double-click on the Winmail attachment to open it. The contents of the attachment will appear in the left pan.

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Click on a file name under the “Filename” heading to see a preview of the file in the right pan.

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Click on a file name to select it. Click “Save As” to save the selected file on your computer as a stand-alone file.

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Click on the “X” in the upper right-hand corner to close the Winmail Reader application.