dynamep.csproj

  <Target Name="AfterBuild">
    <GetReferenceAssemblyPaths TargetFrameworkMoniker=".NETFramework, Version=v4.8">
      <Output TaskParameter="FullFrameworkReferenceAssemblyPaths" PropertyName="FrameworkAssembliesPath" />
    </GetReferenceAssemblyPaths>
    <GetAssemblyIdentity AssemblyFiles="$(OutDir)$(TargetName).dll">
      <Output TaskParameter="Assemblies" ItemName="AssemblyInfo" />
    </GetAssemblyIdentity>
    <GenerateResource SdkToolsPath="$(TargetFrameworkSDKToolsDirectory)" UseSourcePath="true" Sources="$(ProjectDir)\Resources\DynaMEPimages.resx" OutputResources="$(ProjectDir)\Resources\DynaMEPimages.resources" References="$(FrameworkAssembliesPath)System.Drawing.dll" />
    <AL SdkToolsPath="$(TargetFrameworkSDKToolsDirectory)" TargetType="library" EmbedResources="$(ProjectDir)\Resources\DynaMEPimages.resources" OutputAssembly="$(OutDir)DynaMEP.customization.dll" Version="%(AssemblyInfo.Version)" />
  </Target>

dynamepnew.csproj

<Target Name="GenerateCustomization" BeforeTargets="Build">
    <GetReferenceAssemblyPaths TargetFrameworkMoniker=".NETFramework, Version=v4.8">
      <Output TaskParameter="FullFrameworkReferenceAssemblyPaths" PropertyName="FrameworkAssembliesPath" />
    </GetReferenceAssemblyPaths>
    <GenerateResource SdkToolsPath="$(TargetFrameworkSDKToolsDirectory)" UseSourcePath="true" Sources="$(ProjectDir)\Resources\DynaMEPimages.resx" OutputResources="$(ProjectDir)\Resources\DynaMEPimages.resources" References="$(FrameworkAssembliesPath)System.Drawing.dll" />
    <AL SdkToolsPath="$(TargetFrameworkSDKToolsDirectory)" TargetType="library" EmbedResources="$(ProjectDir)\Resources\DynaMEPimages.resources" OutputAssembly="$(TargetDir)DynaMEP.customization.dll" />
  </Target>