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win.dat attachment in Outlook 2007 keeps showing up.

Posted on 2008-10-27
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Last Modified: 2012-06-27
I have a workstation with Outlook 2007.  A win.dat attachment periodically shows up when the user tries to send email attachments and replaces the attachment.  This doesnt happen all the time, but it does happen frequently.  I have read all the existing posts about making sure Outlook is configured to use plain text and it is.  I even went through the user's address book and manually configured each entry to always send using plain text.  
I have even uninstalled and reinstalled Outlook.  Does anyone have any idea how to permanently resolve this issue?
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Question by:webaddo
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by:WilyGuy
ID: 22817790
What type of email is the replied to message?

I have never had any problems using HTML instead of Plain or RTF.
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by:webaddo
ID: 22820983
What type of email?  Not sure exactly what you mean.  What happens is the user creates a new email to a recipient.  She attaches a Word or Excel or PDF to the email and sends it.  When the recipient gets the email, instead of the attachment that was originally sent, there is a win.dat file attached.  Her Outlook 2007 is configured to always send using plain text.  Do you think I should switch to HTML?
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by:WilyGuy
ID: 22821850
It works great for me, and if there is a still a problem, you can troubleshoot further.
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by:maxpower669
ID: 22902115
Hey There,

I came across this problem before,  You wouldnt happen to be using Watchgaurd or mailgaurd are you?  I found this problem lied in networks that were tightly secured by their firewall's.

Another thing is do you have more then one local domain?
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webaddo earned 0 total points
ID: 22993842
Hi guys.  I uninstalled Outlook and reinstalled and the problem seems to have gone away.  thanks for your help.
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