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

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.

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.

Change Association This Time Sometimes you may want to open a data file with a different program. To open a file by choosing the application, see Win Open With.

If you double-click a file and it opens in the wrong program, try this: In Windows’ File Explorer, right-click a file with the extension you have in mind, and select Open with.