MonoGame.Samples/Sound/Core/Sound.Core.csproj

  <!-- .xnb copy ItemGroup moved inside <Project> below -->
<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <TargetFramework>net8.0</TargetFramework>
    <RootNamespace>Sound.Core</RootNamespace>
    <AssemblyName>Sound.Core</AssemblyName>
  </PropertyGroup>
  
  <ItemGroup>
    <PackageReference Include="MonoGame.Framework.DesktopGL" Version="3.8.*" />
  </ItemGroup>
  
</Project>