System.Windows.Extensions.csproj

<Project Sdk="Microsoft.NET.Sdk">

  <ItemGroup>
    <ForwardedType Include="System.Media.SoundPlayer" />
    <ForwardedType Include="System.Media.SystemSound" />
    <ForwardedType Include="System.Media.SystemSounds" />
    <ForwardedType Include="System.Security.Cryptography.X509Certificates.X509Certificate2UI" />
    <ForwardedType Include="System.Security.Cryptography.X509Certificates.X509SelectionFlag" />
  </ItemGroup>

</Project>