Threat Modeling Tool update release 7.3.00729.1 - 07/29/2020

Version 7.3.00729.1 of the Microsoft Threat Modeling Tool (TMT) was released on July 29 2020 and contains the following changes:

  • Bug fixes

Known issues


Some customers have reported receiving the following error message when downloading the Threat Modeling Tool:

The threat model file '$PATH\TMT7.application' could not be deserialized. File is not an actual threat model or the threat model may be corrupted.

This error occurs because some browsers do not natively support ClickOnce installation. In those cases the ClickOnce application file is downloaded to the user's hard drive.


This error will continue to appear if the Threat Modeling Tool is launched by double-clicking on the TMT7.application file. However, after bypassing the error the tool will function normally. Rather than launching the Threat Modeling Tool by double-clicking the TMT7.application file, users should utilize shortcuts created in the Windows Menu during the installation to start the Threat Modeling Tool.

System requirements

Documentation and feedback

Next steps

Download the latest version of the Microsoft Threat Modeling Tool.