Winmail Decoder offers a fast and reliable way to extract, view, and save the contents of winmail.dat files. You just need to double-click on the winmail.dat file and you're instantly presented with a list of its contents. You can double-click on the attached files to open them, or drag and drop them onto the desktop. Exporting files in winmail.dat is easy, and you can even preview the attached files using QuickLook. In most circumstances, you won't even need to leave your Mail program.