How to open winmail.dat file email attachment? My boss can't open attachments in his Lenovo K3 NOTE and all he got was a winmail.dat file. What settings should I use to get rid of winmail.dat file and open the attachments?
Microsofts Outlook e-mail program sometimes sends e-mail attachments as "Transport Neutral Encapsulation Format" (TNEF). This attachment is usually named "WINMAIL.DAT".

You should install the Winmail.dat Opener(1.7mb) or Free Winmail Viewer(6.9mb) app from the play-store. Opening the file will reveal you multiple files packed into it just like a zip file.


  How to open a winmail.dat file?
  
  
  Select Winmail.dat Opener from the context menu of the winmail.dat attachment.
  Start Winmail.dat Opener and use the built-in file dialog to select a previously saved winmail.dat file. Once you are at the
  contained files list, you can long click a file to open it or select
  files and click the "save" icon from the action bar to save all
  selected files to the sdcard. All files will be saved to a directory
  called "winmaildatopener". 
  After successful export of a file to this
  directoy an open file dialog will enable you to start further actions,
  like open, share on the exported files.