WinMail DAT Viewer
WinMail DAT Viewer is a utility for macOS that opens and extracts the contents of winmail.dat files — a legacy attachment container format sometimes generated by Microsoft Outlook when sending emails with rich formatting, embedded images, or special formatting to non-Outlook clients. The app lets users view the contents of these files, extract embedded attachments, and save them to disk. It is primarily used by business professionals and email users who receive winmail.dat files from Outlook-using colleagues or clients and need to access the embedded content on a Mac.
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1 suggestionWinMail DAT Viewer has not been meaningfully updated since 2017 — the latest publicly available version is 2.3, released over eight years ago. There is no clear indication of a native Apple Silicon build, and the vendor appears to have stopped active development. The app continues to run under Rosetta 2 today, but Apple is removing Rosetta in macOS 28 (September 2028), so an Intel-only build will stop launching at that time. Before that deadline, you have two practical options: contact the vendor (Lawbox) directly to confirm whether a native Apple Silicon build is planned, or migrate to an alternative. Many users find that newer versions of Microsoft Outlook for Mac on Apple Silicon can open winmail.dat files directly, and several mail clients (Thunderbird, The Unarchiver with plugins) can also extract the contents. If you handle winmail.dat files infrequently, online conversion services exist as a short-term workaround, though storing emails or attachments through a third-party website carries privacy considerations.
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