In my C# project file I have:

  <ItemGroup>
        <AvaloniaResource Include="Assets**"/>
  </ItemGroup>

I can then access image files at runtime as follows:

... AssetLoader.Open(new Uri("avares://" + assemblyName + "/Assets/Icons/" + imageFileName)) ...

However, I’d like to share an Assets folder among many applications – this folder would be independent of the project folder. How would I do this?