If you're having trouble opening a DAT file, I'll show you a simple and free way to do it. This method works on both Mac and PC. Just open your browser and go to winmaildat.com. It's a ...

What is the deal with those winmail. dat files? I get them in my email all the time, and nothing seems to be able to open them.

Right-click on the DAT file you want to open and select Open with from the drop-down menu, then choose the text editor. If the DAT file is a video, you can open it with its associated video app.

Another approach is to download a program that can translate the winmail.dat file. Several developers have created helpful programs that can open the files.