Winmail.dat Opener is the easiest, fastest,
most reliable way to extract, view, and save the contents of winmail.dat, msg, xps files.
It's completely frustration-free: just double-click the win mail.dat file and you're instantly presented with a list of its contents. Double-click the attached files to open them, or drag and drop them on the desktop. In most circumstances, you won't even need to leave your Mail program.
Note:This app only lets the user see what files are contained win the .dat file, and that actually previewing or saving the individual files requires a purchase.