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

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.

WaitList.dat file in Windows 11/10 WaitList.dat is a data file which has been found to contain stripped text from email, contact and document files as a function of the Windows Search Indexer.

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 you regularly receive winmail.dat files from business associates, Letter Opener is well worth the investment.