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This is not a postfix related problem as the attachment is neither created nor modified by postfix. a winmail.dat is a attachment from Microsoft outlook and can not be opened by all email programs automatically. So your problem is a mail client issue and not related to your server.
If you want to open the attachments manually on your computer, google for soemthing like open winmail.dat or similar, you will find a lot of guides for that for different operating systems.
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