PreserveNewest nativelibs\windows_x86\grpc_csharp_ext.dll PreserveNewest nativelibs\windows_x64\grpc_csharp_ext.dll PreserveNewest nativelibs\linux_x86\libgrpc_csharp_ext.so PreserveNewest nativelibs\linux_x64\libgrpc_csharp_ext.so PreserveNewest nativelibs\macosx_x86\libgrpc_csharp_ext.dylib PreserveNewest nativelibs\macosx_x64\libgrpc_csharp_ext.dylib