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

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 ...

If 7-Zip cannot open an archive or compressed file and you see Cannot open file as archive error message, here's what you can do.

Many times when receiving mail attachments with the new Exchange-enabled Microsoft Entourage v.X from Windows users, you will get a winmail.dat file that is inaccessible under Mac OS X. Alan Sill ...

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.