winmail.dat

I have a client who is running Windows and has an iPhone.   His email provider is AOL.   More often than not, when I send him an image (as either an attachment or inserted in the body of the email) he gets a "winmail.dat" file - which nobody seems able to open.  What causes this, and is there anything we can do to fix it?

Thanks,

Phil
philsimmonsAsked:
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