.NET RID not supported

[nxtn]

It would be good if we don't need to explicitly specify <Platform> if it has been implied by <RuntimeIdentifier>/<PlatformTarget>.

dotnet publish -c Release -r win10-x64

-or-

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

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net5.0</TargetFramework>
    <RuntimeIdentifier>win10-x64</RuntimeIdentifier>
  </PropertyGroup>

</Project>

It's valid to add a project reference from a Any CPU project to a x64 one.

exe> dotnet add reference ..\lib\
Reference `..\lib\lib.csproj` added to the project.

exe> dotnet build
  Determining projects to restore...
  lib -> lib\bin\x64\Debug\net5.0\lib.dll
  exe -> exe\bin\Debug\net5.0\exe.dll

[stevenbrix]

Related to this, we need the vcrtforwarders dlls to be in the correct runtimes\win10-x64\native directory, so that they are copied to the proper location for .NET5 apps. We can't rely on native assemblies being copied next to the .exe, as it breaks behavior with DllImport. See related issue microsoft/CsWinRT#266