Hi @Rusty Crabbs (amazing username, by the way),
The dotnet repository lists the following files as supported file types that can be signed with Azure Sign Tool using Azure Key Vault:
.msi
, .msp
, .msm
, .cab
, .dll
, .exe
, .appx
, .appxbundle
, .msix
, .msixbundle
, .sys
, .vxd
, .ps1
, .psm1
, and any portable executable (PE) file
It should also support the same file extensions as the Windows SDK signtool. I reached out to the Key Vault team to see if they have a more comprehensive list. I believe it should be able to sign any file type that supports digital signatures, but I reached out to the Key Vault team to confirm this as well.