This "might be" other things also, but in most cases it is
a message that was sent from an e-mail program that is
not quite set up properly...

http://support.microsoft.com/kb/q138053/
    *This article describes how either an Exchange Server
    *administrator or end users can prevent the Winmail.dat
    *attachment from being sent to Internet users when using
    *the Microsoft Exchange Internet Mail Connector (IMC). 

You can open almost "any" file in notepad (especially "smallish"
ones), but this one is likely in binary, and will not look like much...

                                        Rick Glazier

> -----Original Message-----
> When I double click the attachment, then click open a message appears
> "Application Not Found"
> 
> At the foot of the attachment there is a note "WinMail.dat----4KB"
> 
> How can I open this attachment, please ?


-- 
No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.1.375 / Virus Database: 268.2.0/275 - Release Date: 3/6/2006

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