Why does Mail change my attachments to DAT

I am looking for help on why the mail program on my iMac and MacAir change attachments sent to me to DAT files.  The type of attachments doesn't matter.  They can be Excel, PDF, or whatever, but when they come over, they are using a DAT extension.  I've tried sending from various computers and other friends have sent me e-mails with attachements, but they always get changed to DAT files.  When I receive e-mails on my Roadrunner account, they come over correctly on the same computers.
Thanks,
Scott

Hi Scott, it's because the silly users on the other end. & MS..
http://www.twistermc.com/583/open-winmaildat-files-mac/
https://itunes.apple.com/us/app/windat-opener/id405924251?mt=12

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