If the attachment has an extension of ".dat", then Windows would need to
open it with whatever is associated with that file type. If you have no
association, which is not surprising, then you would need to save the
attachment and then open it with whatever program is appropriate. The ".dat"
file type is associated with various applications including possibly a plain
text document. Do you know what the attachment contains?

Peter
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-----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 ?

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