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.

How to Convert DAT to Text in Excel. DAT files are files with an extension that isn't associated with a specific application or program and can be almost any type of file including video, media or ...

Tips on opening a winmail.dat file, keeping seldom-used ink cartridges from drying out, and undoing an Undo.