Open winmail.dat files inside Thunderbird
When someone sends you email from Outlook, attachments sometimes arrive as a single winmail.dat file. Winmail Unpack shows the real files inside and lets you save them. It runs on your computer, and nothing is uploaded.
- Open any single winmail.dat attachment
- Save one file or all files from that email
- Works on current Thunderbird releases
- No account, no limits
- Batch: extract every winmail.dat in a whole folder at once
- Choose a destination folder and file-name rules
- Includes all updates for the life of the product
Reserve Pro (free, non-binding)
Pro batch extraction is not available yet. Reserving is free and not a purchase: no payment details are collected. If Pro is built, we will email you once with the launch price and a link. You can ignore it.
Help
How to use it. Install Winmail Unpack from the Thunderbird add-ons site. Open an email that has a winmail.dat attachment, then click the Winmail Unpack button in the message toolbar. You will see the files inside. Click Save for one file, or Save all to put them in one folder in your downloads.
The button is grey. This email has no winmail.dat attachment, so there is nothing to unpack.
"Could not read this file". The attachment is damaged or is not a real winmail.dat. Ask the sender to send it again, or to turn off "Rich Text" format in Outlook for your address.
"Some files may be incomplete". Part of the winmail.dat looks damaged. Files that open normally are fine.
Privacy. Everything happens inside Thunderbird on your computer. Your emails and files are never uploaded.
Report a problem
Tell us what happened. Please do not attach the email itself. We reply by email.