CustomIInspectable.csproj

<?xml version="1.0" encoding="utf-8"?>
<Project Sdk="Microsoft.Build.NoTargets;Microsoft.Windows.WinmdGenerator">

  <PropertyGroup Label="Globals">
    <ManagePackageVersionsCentrally>false</ManagePackageVersionsCentrally>

    <!-- Turn off some things commonly set by the SDK.props stuff -->
    <TargetFramework>netstandard2.0</TargetFramework>
    <IsAotCompatible>false</IsAotCompatible>
    <UseUwp>false</UseUwp>

    <OutputWinmd>CustomIInspectable.winmd</OutputWinmd>
    <WinmdVersion>255.255.255.255</WinmdVersion>
    <TargetPlatformVersion>10.0.19041.0</TargetPlatformVersion>
    <ShowEmitWinmdOutputDetails>true</ShowEmitWinmdOutputDetails>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Microsoft.Windows.WinmdGenerator" GeneratePathProperty="true" Version="0.63.31-preview" />
    <PackageReference Include="Microsoft.Windows.SDK.CPP" GeneratePathProperty="true" Version="10.0.26100.7705"/>
    <PackageReference Include="Microsoft.Windows.SDK.Win32Metadata" GeneratePathProperty="true" Version="63.0.31-preview"/>
  </ItemGroup>
  <PropertyGroup>
    <AdditionalIncludes>$(AdditionalIncludes);$(Pkg_MicrosoftWindowsSDKCPP)\c\Include\10.0.22621.0\shared</AdditionalIncludes>
    <AdditionalIncludes>$(AdditionalIncludes);$(CompiledHeadersDir)</AdditionalIncludes>
  </PropertyGroup>

  <ItemGroup>
    <ScraperRsp Include="libMappings.rsp"/>
  </ItemGroup>

  <Target Name="BuildPartitions" BeforeTargets="BeforeBuild">
    <ItemGroup>
      <Headers Include="$(CompiledHeadersDir)\customiinspectable.h" />
      <TraverseFiles Include="%(Headers.FullPath)"/>
      <None Include="main.cpp" />
      <Idls Include="customiinspectable.idl"/>
      <Partition Include="main.cpp">
        <TraverseFiles>@(TraverseFiles)</TraverseFiles>
        <Namespace>CustomIInspectable</Namespace>
      </Partition>
    </ItemGroup>
  </Target>

</Project>