Winmail.dat opener

Open the winmail.dat someone accidentally sent you.

Microsoft Outlook sometimes wraps message formatting and attachments in TNEF. Drop the file here to recover what is inside.

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

    Drop winmail.dat

  2. Step 2

    The TNEF container is decoded locally

  3. Step 3

    Download the recovered attachments

What this workspace preserves

Recognizes the TNEF signature

Recovers embedded attachment names and bytes

No Outlook installation required

Questions about this workflow

Why did I receive winmail.dat?

It is commonly produced when Outlook sends rich-text formatting to a recipient whose email client does not understand TNEF.

Is winmail.dat itself a virus?

It is a container format. Treat recovered files with the same caution as any email attachment.