Is there an app extract the contents of the mail about winmail.dat files on Mac?

I use Mac for my works, I received a lot of winmail.dat files from the senders who are using Microsoft Outlook, but I don’t know how to extract and save it, the contents is very important for me. I need them to do my works. This question has been bothering me for a long time, I am eager to solve. Does anyone know what method can I fix?