Winmail.dat Outlook

Microsoft Outlook automatically generates a winmail.dat file when an Outlook email user composes and sends a message using the Rich Text Format or HTML Format. These formats attach the .dat file to the the end of the email message. But what is a winmail.dat file, really? A winmail.dat file contains email formatting information, in an unreadable form for humans. Microsoft Outlook uses this data on the receiving end to display email messages correctly.

Unfortunately, Outlook is the only email client program that utilizes winmail.dat information. This means anyone not using Outlook, who receives and opens an email in the HTML or Rich Text format, will find a winmail.dat file attached as well.

Winmail.dat Outlook

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Microsoft Outlook has many options, one of which is the ability to send emails using different text formats. As useful as these extra formats might be, this is the ultimate cause of winmail.dat files which might require additional programs to open. Winmail.dat files are created and can cause problems for users of webmail and email clients such as Eudora, Gmail, Yahoo, etc.

As a further more updated resource, check out this June 11th 2019 video from Gordon of Gimmio. The video provides a step by step guide on what winmail is and how to stop winmail.dat files being sent with Outlook, on the latest version of Windows.

the other went to an AOL user. They opened the email in AOL webmail on google chrome. I saw that they had 2 files - a winmail.dat and the PDF. Clicking on the PDF (with the correct name and PDF extension). it downloaded as untitled (34). And then trying to open the download, got an error there's no app for this type of file (there was no .PDF extension.

Note, the problem I described in the "Original Case" filed in November, 2021, has returned. It describes how simple e-mails in HTML format were being returned encapsulated in winmail.dat wrappers just as in this case. This bug was eventually fixed by Comcast. Now, we have the same problem all over again!!!

See -us/outlook_com/forum/all/with-outlook-2016-sending-an-e-mail-in-html-format/de5e04ba-fef0-4cf8-99f4-6385e343dbd2?messageId=a3d14e7b-b45a-4733-a15b-7d3f61c2dc32 for the full, but unresolved, story. So far, It doesn't appear that this time around Microsoft will actually fix the underlying regresion in a future update.

If you receive an email with an attachment called winmail.dat this mail is probably sent by someone who uses the Microsoft Outlook Rich Text Format (RTF) format for the message. This works without 'side effects' if the recipient of the message also uses Microsoft Outlook.

I am emailing Evernote directly, I am not asking outlook to auto forward or redirect anything. I am emailing straight from my own email to my own Evernote email. I am not sure about Outlook integration. I work at a financial firm and my email is pretty controlled by our tech team so i would assume no.

Hello, i am having the windat issue. The odd thing is it just started happening as I have used Evernote for months without issue. I have taken all the steps within outlook in terms of converting the email and contact to plain text. Any other thoughts on this? Love Evernote but this is putting a severe crimp on my workflow

don't use outlook. ;)

and that's not just the pdf renamed, but some special file format.looks like you need "mail format" under tools | options... to be either html or plain text, as well. if you're sending it to yourself (still an outlook account) then it's not going to convert.-ashley

sent from my modified k-9 mail

> and that's not just the pdf renamed, but some special file format.

> looks like you need "mail format" under tools | options... to be

> either html or plain text, as well. if you're sending it to yourself

> (still an outlook account) then it's not going to convert.

There is no such thing as 'an outlook account'.I think what you meant was, if the mail server hosting the account *and*

being used for sending the email to himself is an EXCHANGE server, then

yes, what you said is correct. But, just sending from a standalone

Outlook using a NON exchange based server/host will not cause this problem.Following is an email template I keep around explaining this problem and

potential solutions to corporate senders (since they are the only ones

who can fix the problem permanently):********************Hello,Fyi, we are receiving all of your emails with one or more 'winmail.dat'

files as an attachment.This is a known issue with Microsoft Outlook and Exchange Server that

causes non-Exchange recipients of your emails to get these attachments.

It isn't a problem if you aren't including any actual attachments (like

PDF or Word/Excel files) - but if you do, these won't be readable by our

Sales Reps (without my having to decode them individually with a special

tool).Here is a Microsoft Tech Document outlining the issue, including

different ways to resolve it: forward this to your IT person. If they choose not to implement

the change at the server level, then they should be able to help you

configure your Outlook to not send these to the MBI addresses in your

address book.As always, feel free to contact me if you need any assistance with this,

or any other issue.********************Following is an email template I keep around to send to individual/home

users experiencing this problem, and how they can work around it if

necessary:********************Hello,If you have ever received any email messages with one or more

attachments named 'winmail.dat' that you couldn't open, this is a known

configuration problem/issue with Microsoft Outlook and/or Microsoft

Exchange Server.Here is a Microsoft Tech Bulletin outlining the issue, including

different ways (one is a very simple change that the sender can make to

your email address book entry) to resolve it: , the only way to permanently fix the problem requires the SENDER

to make a change to their server, or at a minimum, to your email address

book entry in their Outlook program.It isn't a problem if there aren't any actual attachments (like

PDF or Word/Excel files) - but if there are, these won't be readable

without decoding them with a special tool.Thankfully there are a couple of options. Thunderbird has an extension

called 'Lookout', that will automatically decode these files and show

them to you as normal attachments in the attachment pane: -us/thunderbird/addon/lookout/There is also a free program called 'Winmail Opener' that will decode

these files for you that you can download from here: _opener/Winmail Opener is easy to use. It is not necessary to install it

(although you can), you can just download the file winmail_opener.exe to

your desktop, unzip/extract it to a folder, and use it as a

standalone/portable file. I used to do this for our company, and kept

the portle file on the server, so that everyone could use it without

having to install it. But for personal use, I recommend that you simply

install it after downloading it.Once it has been installed, whenever you get an email with a winmail.dat

attachment, simply:1. Right-click on the winmail.dat attachment, and then click 'Save As'2. Save it to your desktop3. Minimize all of your programs so you can see your desktop4. Drag the winmail.dat file you just saved directly on/into the

'Winmail Opener' shortcut that the installer placed on your desktop so

that it turns dark and then release the mouse button5. A new Winmail Opener window will open, showing you the decoded

attachments (in the pane on the right side). You can now open the

attachment(s), or drag/drop them to your desktop to save them permanently.You can now delete the 'winmail.dat' file , or if you want to save it,

move it to an appropriate location.As always, don't hesitate to call/email if you have any problems or

questions...

>On 2012-01-07 5:47 PM, ashley willis wrote:

>> neil154 wrote:

>>> I sent from my PC an email to myself to test reading attachments.

>>> I send a pdf file 2.3 meg and when I received it on my Bionic it

>>> was renamed to winmail.dat. When I look at the received file on my

>>> PC it is a PDF.

>>>

>>> Can you explain to me why it was renamed and how to prevent it

>>> from happening.

>> don't use outlook. ;)

>Bah... as much as I loathe Outlook, people are free to use the client

>of

>their own choosing, so please spare the anti Microsoft crap....

it was an anti-outlook/exchange/whatever stab, independent of my views on microsoft in general. and a wink, so not a serious suggestion -- plenty of business users don't have a choice. and I did my best to be helpful.

I have been sent a winmail.dat file attachment and cannot open it. I am confused first by the options for tnef:- tnef, ktnef, ktnef5. I assume the tnef is simple command line and the others are associated with KDE desktop.

Sadly none are working. I get messages from Thunderbird that there is no application installed that can open files of the type TNEF message even though I have ktnef installed.

If I run from console I get message

A winmail.dat file is a file containing information sent with a Microsoft Outlook email which allows it to retain all its files, fonts and format. If the recipient is also using Outlook, this file can be automatically decoded, if not, the winmail.dat file will appear in addition to your message, but often ruining the included files, font styling and formatting.

The winmail.dat file is almost always generated when Outlook is sending your emails in Rich Text Format (RTF) which other email clients don't support. By changing your Outlook settings, you'll be able to prevent Outlook from sending this pesky file. you'll

Outside world complain, that they receive winmail.dat instead of original e-mail. I know, there are programs how to read this type of attachment and recover message but, it is not good for users and experience. e24fc04721