Why Do I Receive Winmail Dat Files ?
Winmail dat files are generally received when your mail
program is unable to properly decode the email being sent to you.
This can happen for a number of reasons, but the most
common is due to different email clients.
For example if an email is composed and sent from Microsoft
Outlook it allows extra information called Transport Encapsulation Format or
TNEF for short to be sent with the email, this extra information contains
information such as fonts, colors and formatting, and if this email is received
by someone using outlook then it retains the original look and feel.
Because TNEF is only relevant to users of Outlook, other
email programs such as Netscape or Outlook Express will also receive a
dat file attachment.
To get around these problems, make sure the email
sender turns off RTF or rich text format.
To do this from Outlook select
Tools > Options > Mail Format tab, and change
Compose in
this message format to Plain Text

Using plain text you’ll lose options such as colors, font
types etc, but no matter which email program opens the email it will be fine.
It will also take up far less space than email composed
using rich text or HTML
If you really want to read the contents of the winmail.dat
file then you have a the following options.
- Install full blown Outlook, a trial version can be
downloaded from Microsoft
- Search the web for an application such as WmDecode
which will allow the attached dat file to be opened.
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