How to open a winmail2.dat file?

How to open a Winmail2.dat file? Is it related to Microsoft Outlook?

I just looked on the internet via the seach engine dogpile.com. Apparently winmail.dat is a outlook format file that is attached to e-mail messages that are not being sent in plain text format.

There is a way to read them. From:http://facstaff.gpc.edu/~jbenson/resource/winmail.htm

...One solution to the problem is to visit http://www.biblet.com and download the WMDecode program found there (look about halfway down the page). This will at least allow you to decode the winmail.dat files and extract any useful attachments from them....