Threat Modeling Tool update release 7.3.31026.3 - 10/26/2023

Version 7.3.31026.3 of the Microsoft Threat Modeling Tool (TMT) was released on October 26 2023 and contains the following changes:

• Bug fixes
• Accessibility fixes

Known issues

Errors related to TMT7.application file deserialization

Issue

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 don't natively support ClickOnce installation. In those cases the ClickOnce application file is downloaded to the user's hard drive.

Workaround

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

• Supported Operating Systems
  • Microsoft Windows 10 Anniversary Update or later
• .NET Version Required
  • .NET 4.7.1 or later
• Additional Requirements
  • An Internet connection is required to receive updates to the tool as well as templates.

Documentation and feedback

• Documentation for the Threat Modeling Tool is located on docs.microsoft.com, and includes information about using the tool.

Next steps

Download the latest version of the Microsoft Threat Modeling Tool.