As a general rule, you should never open any email attachment unless you’re sure what it is and trust the email sender. The first thing to say about opening winmail.dat files is be careful. How to open a winmail.dat file on your Mac In some cases, the winmail.dat attachment may actually be a real attachment, such as a Word document or calendar invitation that has been wrongly encoded. 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.įeatures described in this article refer to the MacPaw site version of CleanMyMac X. It really comes in handy if you are looking for a fast solution to opening encoded Outlook DAT attachments.So here’s a tip for you: Download CleanMyMac to quickly solve some of the issues mentioned in this article. If your e-mail program is not set or cannot read the Outlook formatting instructions, Winmail Opener can do the trick. Evaluation and conclusionĭesigned with simplicity in mind, this multi-lingual application is very easy to use, which makes it suitable for any type of user. The software can also be run using the command console, where you can process multiple encoded messages at the same time or even decode a file and save its attachments without viewing it. Also, the detected attachments can be dragged and dropped to any location in order to save them to your PC. Once the DAT file is selected, you can view the detailed information embedded into the TNEF file, such as the mail subject, sender and the message content, which can then be saved in an RTF format to a custom location. View information, save it to the HDD and use a command console In order to open a new winmail.DAT file, you can use the default PC browser or just drop it in the main window of the program. DAT file, the interface only comprises two panes, one for the message body and one for the attachments. Simple GUI with support for “drag and drop”Īs all it does is decrypt the. Such a program is Winmail Opener, a lightweight utility that can “translate” TNEF encoded messages. In order to view the hidden content of these attachments, you could instruct the sender to change Outlook's settings or use an application that can read them. If your e-mail client is not set to support the Microsoft Outlook rich text format, you might receive an e-mail message that carries a "winmail.DAT" attachment, due to the fact that mail programs handle file formats differently.
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