Trust Prompt Tool

This free application allows you to configure the ClickOnce trust prompt behavior of your Windows operating system through a graphical user interface. This is more convenient and safer than editing the registry directly (with regedit.exe).

Start the tool by running the downloaded file (no installation required). It will read and display the current trust prompt configuration from the registry:
Trust prompt behavior: disabled for all zones

The trust prompt behavior can be configured for five security zones. You can make changes by selecting one of the following values from the dropdown lists:

  • Enabled: The ClickOnce trust prompt is always displayed. Users can choose if they want to trust an application or not:
    Trust Prompt - do you want to install this application
  • AuthenticodeRequired: The ClickOnce trust prompt is only displayed for applications which have been digitally signed (same trust prompt dialog as above). Installation is not possible if the application is not signed with a valid certificate identifying the publisher:
    Your security settings do not allow this application to be installed on your computer
  • Disabled: The ClickOnce trust prompt is never displayed. The message “your administrator has blocked this application because it potentially poses a security risk to your computer” is shown with no option to trust the application:Your administrator has blocked this application because it potentially poses a security risk to your computer

To write the values to the registry, click on the Write to registry button:
Write trust prompt configuration to registry

A confirmation is shown if the operation completed successfully:
Configuration written to registry

Please note:

  • If a zone is not defined in your registry, the dropdown list will show an empty value as the selected item.
  • If your registry does not contain the key \HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\.NETFramework\Security\TrustManager\PromptingLevel, the application will display a warning. You can still use it to create the registry entries.
  • The trust prompt settings have no effect on already installed ClickOnce applications (and on their updates).

Administrator privileges are required to run this application (as it accesses the registry). This free Trust Prompt Tool is provided “as is” without warranty of any kind. We recommend always making a backup of the registry before modifying it.

So far we have successfully tested our Trust Prompt Tool with the following operating systems:

  • Windows 10 x64 (Pro, version 1803)
  • Windows 7 x86 (Enterprise, version 6.1)
  • Windows 7 x64 (Ultimate, version 6.1)

Please leave a comment should you experience any issues with our software. For support concerning Windows, trust prompt behavior and ClickOnce applications in general, please contact Microsoft.

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