I get winmail.dat attachments from my Co. they will not open I tried notepad and got nonsence

I just started with a new Co. And they send e-mail attachments as winmail.dat When I open I get junk. I've gone into applications in Options but all form still give me junk notebook ect...
Any suggestions

90 known files types using the '''.dat''' extension. <br />
http://www.file-extensions.org/dat-file-extension-video-cd-mpeg-movie-mpeg1
Ask your company's IT department or a co-worker who's been there for a while what program you should use to open those files.

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The above KB doesnt really help me, sending plain text emails is like going back to the dark ages!
I am sending from outlook to outlook (I send from my external email address, to my work email address and visa-versa)
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If someone sends me an attachment via hotmail, the attachment works ok.
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Hi
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I get winmail.dat attachments from my Co. they will not open I tried notepad and got nonsence

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