winmail.dat on macOS

Get the real attachment out of winmail.dat on Mac.

Drop the TNEF container from Finder and download the files Outlook wrapped inside it.

Workspace status

Ready · Local browser memory

Drop a file to recover attachments

Open it once. Reader, safety, headers, route, redaction, and export reuse the same in-memory source.

.EML
.MSG
.EMLX
winmail.dat
Processed locally. Files and filenames stay on this device.
Workflow

From source file to finished result

Runs locally
  1. Step 1

    Save winmail.dat to your Mac

  2. Step 2

    Drop it into the local decoder

  3. Step 3

    Download the recovered files

What this workspace preserves

No Outlook installation

Original attachment bytes retained

Local ZIP creation

Questions about this workflow

Why does this happen on Mac?

The sender's Outlook configuration can encode rich-text data and attachments as TNEF, which other mail clients expose as winmail.dat.

Will changing my Mac settings prevent it?

The durable fix usually belongs on the sender's Outlook or Exchange side. This tool helps recover the current files.