Cannot Open E-Mail Attachements

I have a Mac Book Pro and I am finding I cannot open attachments that my husband sends from his computer that is Windows based. I always get win mail.dat as the title of the attachment and when I download it I get a picture of a traffic cone with orange strips on it and I still cannot open it.

That winmail.dat attachment is a kind of Outlook/Exchange-ecosystem "universal" container for encoded files of many types. If you husband cannot adjust the settings in his email program to avoid the use of the container file, there are programs that you can run on your Mac to decode it. One such is called "TNEF's Enough" ("TNEF" standing for "Transport Neutral Encapsulation Format" used to encode winmail.dat attachments).
See http://en.wikipedia.org/wiki/Transport_Neutral_Encapsulation_Format for more information.

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