What is win mail.dat

[Lou@milton]

I have a friend who often sends me files. The file says win mail.dat What is this? When I try to open it, it shows up as "AUTOMATER" ? But it doesn't open the file.
Can anyone help me with this?

 

[MightyGem]

This tells you what it is:

Winmail.dat File Causes & How To Open Them + 2019 Video Guide

What is a winmail.dat file and what causes them? Learn how to open these files and how to prevent them for non Outlook email recipients forever.

www.fastmetrics.com

and this may help you open it:

Open winmail.dat attachments.

Extract the content of this pesky Outlook attachments called winmail.dat or ATT0001.dat with this online tool. No registration or email required.

www.winmaildat.com