About this service

What is a winmail.dat file?

If Microsoft Outlook is badly configured it sends attachments as a file called "winmail.dat" or "ATT0001.dat".
A winmail.dat file is a ‘package of information’ sent with a Microsoft Outlook email, allowing it to retain all its original data and features – its files, fonts and format, for example. If the recipient is also using Outlook, this ‘package’ can be automatically decoded, if not, the winmail.dat file will appear in addition to your message.

What can I do with this extractor?

This service helps you to simply convert winmail.dat or ATT0001.dat files and extract the contained files into accessible, readable files. When you upload your winmail.dat attachment, we extract all contained files and save them for you to download them. After that, you can download the attached files from the results page.
Note: Not every winmail.dat attachment contains files– it may include information about the email’s layout and styling.
Also, our service is unable to extract images that have been pasted directly into an email.

How do I use this service?

  1. Save the attachment on your computer.
  2. Click on the 'Browse' button and select the saved file.
  3. Click on 'Start' to upload the file.
  4. Download the content of the .dat attachment from the results page.

Frequently asked Questions

The result page is empty?

This occurs when there are no files in your winmail.dat and instead, the information was related to the email’s format, fonts and colours. If the winmail.dat is smaller than 20kb, it is unlikely there are files attached.

My winmail.dat contains sensitive information, can you please delete it?

Extracted files are stored temporary in a save area and are deleted automatically after 30 minutes.