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 ...

Though DAT files, which house data as the shortened name implies, are usually best left alone, here's how you can open them.

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.

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.

Open the Run prompt Type %userprofile% and hit Enter The User Profile folder will open You should see the NTUSER.DAT file here. 3] Why does Windows use a data file to store information ...

Right-click the DAT file on your PC and click "Open." Click "Select a program from a list of installed programs" and click "OK". Click "Microsoft Excel" from the list of programs on your computer.