Problem with MS Exchange changing attached file to .dat files

I know this is not an easy problem, but I would appreciate any help to solve it.

At the church I work at some of the congregation is having problems opening attached files that are send out by email.  They are receiving them as .dat files instead of Word, PDF, etc., files.  It seems to be those that do not use Outlook as their mail clients mainly, but since more and more of our members do not use Outlook but tablets, phones, and iMacs I need to solve this is possible.  I have not had this problem myself on any of my devices, I use a iPhone and iPad to read my mail when away from the office or home.  

We use MS SBS 2011 as the operating system on the server.
We use MS Exchange 2010 for our mail server software.

Any ideas would be welcome.
Bill2802Asked:
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gheistCommented:
You need to disable rich text for all outgoing connectors and for all mailboxes. then .dat (aka TNEF) conversions will stop/
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Bill2802Author Commented:
This is not exactly what is happening, but it encapsulating with HTML formatted email.  But only seems to be happening in Apple mail on an iMac, so I am thinking that it is something to do with the iMac settings.
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gheistCommented:
TNEF was sometimes called "Exchange Rich Text"
Maybe there is a setting to use  htm instead (MIME mail format)
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