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Windows 7: Outlook 2010 Converts .jpg to .windat

02 Feb 2013   #1

Windows 7 Ultimate x64
Outlook 2010 Converts .jpg to .windat

I've a 64 bit Windows 7 machine using Outlook 2010 for my business (via Microsoft Exchange Server) and personal (via POP3). Some recepients get my .jpg and/or .docx attachments as windat files. I've tried HTML, Rich Text & Plain Text to no avail. I done the following solution and had some success sending files:

Located and selected the following registry subkeys:
On the Edit menu, point to New, and then click DWORD Value.
Type DisableTNEF, and then press ENTER.
Right-click DisableTNEF, and then click Modify.
In the Value data box, type 1, and then click OK.
Exit Registry Editor.
Restart the computer.

Anyone have any ideas what I'm not doing properly?

Many thanks,


My System SpecsSystem Spec

02 Feb 2013   #2

Microsoft Community Contributor Award Recipient

Windows 7 Home Premium x64 SP1

This Fixit does not list any manual steps which is strange, but might be worth a try.

Winmail.dat sent as an email attachment in Outlook 2007 and 2010

Also have a look here:

How to Prevent the Winmail.dat File from Being Sent to Internet Users

A Guy
My System SpecsSystem Spec
03 Feb 2013   #3

Windows 7 Ultimate x64
Outook 2010 Converts .jpg to .windat

Thank, Guy. I'll give that a shot.

My System SpecsSystem Spec


 Outlook 2010 Converts .jpg to .windat

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