How to Open Winmail.dat Attachment Files on Mac OS X

Many Mac Mail users who send and receive emails with their Windows counterparts using a mail client like Outlook or Microsoft Exchange will discover a “winmail.dat” file attached to those emails. If you try to open a winmail.dat file on Mac OS X, you’ll usually find there is nothing available to open the attachment, or it often contains gibberish and is illegible.
We’ll show you several ways Mac users can open winmail.dat files attached to emails. We’ll also explain what a winmail.dat file is and where they come from.






Mac users may encounter DOCX files from time to time, often sent from a Windows user as an email attachment or otherwise, as the .docx file types are standard document files created in newer versions of Microsoft Office. But what if you don’t have Office on the Mac? That’s ok too, even if you don’t have Office installed in Mac OS X, you can still open, read, and edit docx files on modern versions of Mac OS X, most often without any added software.




Mail app in iOS allows users to easily add any type of file attachment to an email, as long as the attachment in question is coming from an associated iCloud Drive. This means you can add files from Pages, Microsoft Office documents, PDF, PSD, text and rtf files, or just about anything else, directly to an email on the iPhone, iPad, or iPod touch. The selected file(s) will behave just like a regular email attachment sent from a desktop email client too. Let’s walk through the steps for how to add attachments to emails in iOS.


