Hi @David Watson ,
Just to add to Tianyu's answer:
We only support file types supported by SignTool: https://video2.skills-academy.com/en-us/azure/trusted-signing/faq#what-types-of-files-can-be-signed-with-trusted-signing
That said, the dotnet/Sign project now has a pre-release version with Trusted Signing integration to expand our support to include VSIX, NuGet, and ClickOnce here: NuGet Gallery | sign 0.9.1-beta.24325.5. Once this is more stable, we will publish information more information on how to use it with Trusted Signing.
Support for Azure Trusted Signing · Issue #683 · dotnet/sign (github.com)
Hope this helps!