To change the format of your email:
Open TOOLS | OPTIONS... | MAIL FORMAT
Try using Plain Text format to send your attachment.
For more info:
How to Prevent the Winmail.dat File from Being Sent to Internet Users
http://support.microsoft.com/default.aspx?scid=kb;EN-US;138053
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Nikki Peterson [MVP - Outlook]
I'm having the same problem with Outlook 2000. I did not update my
Outlook with any of the updates so not to have the security
restrictions Microsoft has forced on users. I've done a little looking
into it and found the following:
When I send the (in my case a faxb.exe) attachment via Outlook to users
that do not use Outlook, they receive the winmail.dat file rather than
the faxb.exe file. I had sent a copy of the same e mail to a second
account that I have and looked at it on my pop web mail account. It
was in the winmail.dat format. The I then started outlook and the same
message was downloaded into Outlook and showed up as the faxb.exe
file.
I was able to get my attachment to my clients via sending by web mail
rather than through outlook, but this is cumbersome and I would like to
get Outlook working again.
Anybody have any ideas?