zip file into the directory where you want to install CsvView. When the download completes there should be a. Right-click on the attachment and select ‘save attachment’. Open the mail with winmail.dat file attachment. All you have to do is to open a winmail.dat file, save it, and reliable it as the intended file type. Users from other e-mail clients (like Thunderbird or Lotus Notes) or platforms (like Android, Apple, iPad There are three ways to open a DAT file in Mac. Winmail.dat files are in fact TNEF attachments (transport neutral encapsulation format) sent by the Microst Outlook, Outlook Express or Microsoft Exchange applications. txt file produced by the DJI Go App.DAT from the Phantom 3, Phantom 4, Phantom 4 Pro, Inspire 1, and Mavic Pro Litchi tablet app Autologic tablet app Mac, Linux, iPad, iPhone, Blackberry and other mobile users should use the free online version. CsvView provides the means to visualize log files data via graphs and a Google Earth like viewer. CsvView addresses some of the limitations of DatCon. If you try to open winmail.dat, you will probably be prompted to specify the application that should be used to open the file.