Just open your browser and go to winmaildat.com. It's a straightforward website that lets you upload and open DAT files without needing to sign up or provide an email.

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.

If the DAT file you're trying to open is text, you can convert the file into text in the Microsoft Excel program by first saving it as a CSV file.