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can not open winmail.dat PDF file attachments

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clients send pdf attachments usually electrical drawings for bid and a winmail.dat pdf file shows in attachment. I click on and error message says can not open this type file. I have adobe reader Why?

clients send pdf attachments usually electrical drawings for bid and a winmail.dat pdf file shows in attachment. I click on and error message says can not open this type file. I have adobe reader Why?

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I installed add on and still cant open winmail.dat PDF file

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The attachments should look like this in the attachment pane:

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still can't open

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If you can't open the attachment, have your client/ customer or whatever fix their defective copy of Outlook and send real mail attachments not TNEF encoded rubbish. They are spewing defective email every time they click send on a mail with an attachment.

See https://support.mozilla.org/en-US/kb/what-winmaildat-attachment