It simply works!

Please don’t update this app in case you break it! It works perfectly on all my mails (i.e. attachments) in the Apple Mail app.

Before, I have to save the winmail.dat file to my desktop, rename the extention to .PDF and then it would open up in Preview. Equally, I could write an Apple Script to do the conversion whenever I save a certain file to a certain folder. But why bother?

Now with Winmail Viewer, I can just double-click the attachment winmail.dat file in the mail, and Winmail Viewer automatically launches and offers the option to preview or save the file. That’s fantastic.

iBest about Winmail Viewer - Open dat file