1. Malibu02's Avatar
    I get some of my mail thru Comcast and I have no problem with excel, word, powerpoint , videos etc.
    Anything that is marked "winmail (dat)" I get a message "unable to open this type of file".
    Does anybody know of a fix?
    07-28-2011 05:45 AM
  2. FrankXS's Avatar
    I get some of my mail thru Comcast and I have no problem with excel, word, powerpoint , videos etc.
    Anything that is marked "winmail (dat)" I get a message "unable to open this type of file".
    Does anybody know of a fix?
    The Internet standard for email is Plain Text only. However, in modern days html has become pretty common because every platform has a web browser which supports html (didn't used to be that way).

    Anyway, the problem here (windmail.dat) is on the senders' side. They are sending out (probably unknowingly) a unique proprietary MS Outlook format email. You should inform them to change their MS Outlook setup. Point them to any of the following links that explain winmail.dat and how to prevent sending it out.

    Winmail.dat attachments are included in received e-mail messages in Outlook

    How to Prevent Winmail.dat Attachments from Being Sent in Outlook - About Email

    How to turn off winmail.dat attachments

    Another alternative might be to purchase an office suite that supports MS Outlook Rtf (Rich Text Formatting). I use Officesuite Pro from the Market (on sale now for $14.99 - I paid $29.99).

    I should add, this is not unique to the Thunderbolt or Android.

    -Frank
    Malibu02 likes this.
    07-28-2011 09:14 AM
  3. neil154's Avatar
    I am using Outllok 2007 and sent a email using HTML and my internet setting is to convert to HTML so I have followed all of the Microsoft instructions that you referenced but still the email (which I sent from my PC to myself) still shows up as winmail.dat on my Bionic but as a PDF on my PC.

    Can anyone suggest how to prevent this problem in the future.
    01-07-2012 11:58 AM
  4. FrankXS's Avatar
    I am using Outllok 2007 and sent a email using HTML and my internet setting is to convert to HTML so I have followed all of the Microsoft instructions that you referenced but still the email (which I sent from my PC to myself) still shows up as winmail.dat on my Bionic but as a PDF on my PC.

    Can anyone suggest how to prevent this problem in the future.
    Did you go to the Market and install the Adobe Reader?

    -Frank
    01-07-2012 01:09 PM
  5. neil154's Avatar
    I have several app loaded that will read a PDF but since the extention is a dat they will not open it. If I change the extention to pdf it opens fine.
    01-07-2012 01:15 PM
  6. FrankXS's Avatar
    I have several app loaded that will read a PDF but since the extention is a dat they will not open it. If I change the extention to pdf it opens fine.
    As the sender, are you doing an attachment? Or are you doing a copy/paste into the body of the email?

    Also, try taking a look at the first link I posted in the first message in this thread. Go into your Outlook program and set it to send PLAIN TEXT and then try the attachment PDF again. Make sure MS Outlook is NOT set to send in RTF format.

    -Frank
    neil154 likes this.
    01-07-2012 01:55 PM
  7. neil154's Avatar
    I used Outlook Attachment so it is NOT a paste.

    I also tried sending as text format and that way the file was received as PDF. Not exactly logical nor a method that I would prefer but at least it is a solution. Thanks for the help.
    01-07-2012 02:53 PM
  8. FrankXS's Avatar
    I used Outlook Attachment so it is NOT a paste.

    I also tried sending as text format and that way the file was received as PDF. Not exactly logical nor a method that I would prefer but at least it is a solution. Thanks for the help.
    Great. Glad it worked. Actually, you should also be able to use HTML. I think it's RTF that usually causes that issue. RTF is not a universal standard like TEXT or HTML.

    -Frank
    01-07-2012 04:58 PM
  9. bmarotat's Avatar
    You can open the winmail.dat files using the online version of the Winmail.dat Reader
    01-16-2012 01:27 AM
  10. neil154's Avatar
    It is a lot easier to just change the extension of the attachment rather than installing another app. I was just hoping that I could somehow figure out how tp prevent the .dat but of course I can not control it because I am not the one ususally sending the attachment to me.
    01-16-2012 04:50 PM
  11. FrankXS's Avatar
    It is a lot easier to just change the extension of the attachment rather than installing another app. I was just hoping that I could somehow figure out how tp prevent the .dat but of course I can not control it because I am not the one ususally sending the attachment to me.
    You should inform the sender that anyone using a non-Microsoft email client probably won't be able to read any of their emails. Perhaps, if they care, they will change their configuration. This happens all the time. Not just to you and not just to smartphones or Android. People in MS Office environments just assume that everyone else in the world is also using MS Office. <sigh>

    -Frank
    01-16-2012 08:29 PM
  12. janeshare's Avatar
    I don't get it! I clicked on the "here" for download winmail.dat for my android phone and it says "save or open". Both need me to give it a Windows program. I need this on my phone, so I don't get it!

    thank yuou
    12-29-2012 03:38 PM
  13. neil154's Avatar
    If you go to Download Winmail.dat Reader for Android - Winmail.dat Reader - Open winmail.dat files (Freeware) there is a link to download and install the apk file and then it should work for you.
    12-29-2012 04:24 PM
  14. Alexsandra Seidel's Avatar
    Pessoal, escrevendo em portugus.....sou um usurio inicial do Android e possuo um galaxy s3. Esta semana a samnsung atualizou meu android para a verso 4.1.2, e somente depois desta atualizao que passei a receber os anexos do outlook 2010 como Winmail.dat. Anteriormente a atualizao eu recebia todos os anexos sem problemas. O que eu fao para voltar a receber os anexos corretos? Obrigada
    03-12-2013 10:44 AM
  15. Tango Man1's Avatar
    Converting to PDF didn't help because Adobe Reader still couldn't open it. However, "Kingsoft Office", which is freely downloadable for Android machines, DID open windmail.pdf.
    06-15-2013 07:11 PM
  16. Avist's Avatar
    I have tried all of these suggested fixes. I am using Outlook 2007 & have checked each setting. I have als trie both the Attach function & copy/paste options to attach the PDFs and yet it it still shows up in my Samsung Android emaid as a DAT file. If i send a file to myself it shows up on my PC in Outlook 2007 as a PDF but the same email shows up in my Galaxy S6 email as a DAT file ... while it also shows up in my Android tablet as a PDF. This would suggest that there is a setting or issue on The Samsung or Email on the Samsung tbat needs to be changed. HELP!
    08-12-2016 02:18 PM
  17. neil154's Avatar
    It has been so long ago that I started this issue that I do not remember all of the details but I do believe that the issue is a Outlook problem and not a Android problem. I think if you Google the issue you will see that it appears to be a bug in Outlook. Also, I believe if you search the play store there is an app which will open up a dat file.
    08-12-2016 02:42 PM
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