Winmail.dat Explorer is a free app to open those ‘winmail.dat’ attachments. This app is free of charge, giving you access to the original attachment files without any need for further in-app purchases. The optional in-app-purchase will remove ads and help fund further development of new features.

You can open a file by using the context menu in the windows file explorer or you can use the built-in file picker to select a file.

After extracting the content you can open it with an external viewer, save the contained attachments to a location of your choice or share the attachments via email.

The free version is ad-supported. With an in-app purchase, you can upgrade to the ad-free Pro version.

Kindly note that not every file ending with “.dat” is a winmail.dat (TNEF) file. So, before submitting a one-star review stating that our service didn’t work, please ensure that your file is indeed a winmail.dat file and not one of a hundred different file types with a .dat extension.

If you are looking for an app for Windows 8.1 devices check out our Winmail.dat Explorer for 8.1
https://www.microsoft.com/store/apps/9NPL81JKT51J

Privacy Information:
We do not collect or resale any of your data. The files you open with Winmail.dat Opener are processed on your device. They are not sent over the internet. The files are stored in a temporary folder and will be deleted automatically by the operating system. The app requires the network permission to load ads for the free version. The network permission is not used for any other functionality.