And while the Mac can happily read and write RTF files, somewhere between the message being encoded by Outlook or Microsoft Exchange and it being sent, the message is appended with a winmail.dat file. In some cases, the email sender has set Outlook to compose messages in rich text format (RTF). A winmail.dat file is one that Microsoft Outlook creates as a wrapper for data. You could open it in a text editor and try and determine what type of data is in the file, then manually choose which app to try and open in it by right-clicking the file in the Finder and selecting ‘Open with’ from the contextual menu.įor this article, though, we’re concerned with one specific type of.
Because macOS doesn’t know what type of data the file holds, it can’t assign an app to open it.
That data could be just about anything, including text, graphics, or even video. dat extension simply means the file is a data file. We’ll also tell you why you might not want to open them. In this article, we’ll take a deep dive into winmail.dat files, explain what they are and how you can open them on your Mac. If you regularly receive emails from Windows users who use Microsoft Outlook as their email client, you may have received attachments with the name ‘winmail.dat.’ You’ve probably tried to open the attachment on your Mac and discovered that macOS couldn’t open it. But to help you do it all by yourself, we’ve gathered our best ideas and solutions below.
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So here's a tip for you: Download CleanMyMac to quickly solve some of the issues mentioned in this article.
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