diff --git a/src/CoreFx.Private.TestUtilities/pkg/CoreFx.Private.TestUtilities.pkgproj b/src/CoreFx.Private.TestUtilities/pkg/CoreFx.Private.TestUtilities.pkgproj
index d231608c2270..3749cb671996 100644
--- a/src/CoreFx.Private.TestUtilities/pkg/CoreFx.Private.TestUtilities.pkgproj
+++ b/src/CoreFx.Private.TestUtilities/pkg/CoreFx.Private.TestUtilities.pkgproj
@@ -5,7 +5,14 @@
     <ProjectReference Include="..\ref\CoreFx.Private.TestUtilities.csproj">
       <SupportedFramework>uap10.0.16299;netcoreapp2.0;net461;$(AllXamarinFrameworks)</SupportedFramework>
     </ProjectReference>
-    <ProjectReference Include="..\src\CoreFx.Private.TestUtilities.csproj"/>
+    <ProjectReference Include="..\src\CoreFx.Private.TestUtilities.csproj">
+      <SupportedFramework>uap10.0.16299;netcoreapp2.0;net461;$(AllXamarinFrameworks)</SupportedFramework>
+    </ProjectReference>
   </ItemGroup>
+  <PropertyGroup>
+    <!-- Excluding the reference assets on the package so that RAR will see the run-time conflicts at build time in order to
+    generate the right binding redirects when targeting Desktop. https://github.com/dotnet/corefx/issues/32457 -->
+    <ExcludeReferenceAssets>true</ExcludeReferenceAssets>
+  </PropertyGroup>
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), Directory.Build.targets))\Directory.Build.targets" />
 </Project>
diff --git a/src/Directory.Build.targets b/src/Directory.Build.targets
index 6f541e2ca759..90b43799786b 100644
--- a/src/Directory.Build.targets
+++ b/src/Directory.Build.targets
@@ -57,4 +57,15 @@
     <Message Text="DumpTargets> $(OutputPath), C=[$(Configuration)], CG=[$(ConfigurationGroup)], OG=[$(OSGroup)], TG=[$(TargetGroup)]" Importance="Low" />
   </Target>
 
+  <!-- This target will be moved into buildtools. Checked in here for now to add validationand in order not to block buildtools ingestion. -->
+  <Target Name="ValidateExcludeCompileDesktop" AfterTargets="GetPackageDependencies" Inputs="%(Dependency.Identity);%(Dependency.TargetFramework)" Outputs="unused">
+    <PropertyGroup>
+      <_excludeCompile Condition="@(Dependency->WithMetadataValue('Exclude', 'Compile')->Count()) == @(Dependency->Count())">true</_excludeCompile>
+    </PropertyGroup>
+    <Error Text="Cannot have Exclude=Compile dependencies when targeting a desktop TFM. @(Dependency). You can exclude the reference asset in the package by setting the ExcludeReferenceAssets property to true in your project." 
+           Condition="$([System.String]::Copy('%(Dependency.TargetFramework)').StartsWith('net4')) AND 
+                      '$(_excludeCompile)' == 'true' AND
+                      '%(Dependency.Identity)' != '_._'" />
+  </Target>  
+
 </Project>
diff --git a/src/System.IO.Pipelines/pkg/System.IO.Pipelines.pkgproj b/src/System.IO.Pipelines/pkg/System.IO.Pipelines.pkgproj
index a368a5959c80..34411f828543 100644
--- a/src/System.IO.Pipelines/pkg/System.IO.Pipelines.pkgproj
+++ b/src/System.IO.Pipelines/pkg/System.IO.Pipelines.pkgproj
@@ -6,7 +6,12 @@
         <SupportedFramework>net461;netcoreapp2.0;$(UAPvNextTFM);$(AllXamarinFrameworks)</SupportedFramework>
     </ProjectReference>
     <ProjectReference Include="..\src\System.IO.Pipelines.csproj" />
-    <HarvestIncludePaths Include="ref/netstandard1.3;lib/netstandard1.3" />
+    <HarvestIncludePaths Include="lib/netstandard1.3" />
   </ItemGroup>
+  <PropertyGroup>
+    <!-- Excluding the reference assets on the package so that RAR will see the run-time conflicts at build time in order to
+    generate the right binding redirects when targeting Desktop. https://github.com/dotnet/corefx/issues/32457 -->
+    <ExcludeReferenceAssets>true</ExcludeReferenceAssets>
+  </PropertyGroup>
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), Directory.Build.targets))\Directory.Build.targets" />
 </Project>
diff --git a/src/System.Net.Http.WinHttpHandler/pkg/System.Net.Http.WinHttpHandler.pkgproj b/src/System.Net.Http.WinHttpHandler/pkg/System.Net.Http.WinHttpHandler.pkgproj
index 5f27bf60a5dc..543cb6bd775c 100644
--- a/src/System.Net.Http.WinHttpHandler/pkg/System.Net.Http.WinHttpHandler.pkgproj
+++ b/src/System.Net.Http.WinHttpHandler/pkg/System.Net.Http.WinHttpHandler.pkgproj
@@ -5,12 +5,16 @@
     <ProjectReference Include="..\ref\System.Net.Http.WinHttpHandler.csproj">
       <SupportedFramework>net461;netcoreapp2.0;$(AllXamarinFrameworks)</SupportedFramework>
     </ProjectReference>
-    <ProjectReference Include="..\src\System.Net.Http.WinHttpHandler.csproj" />
+    <ProjectReference Include="..\src\System.Net.Http.WinHttpHandler.csproj">
+      <SupportedFramework>net461;netcoreapp2.0;$(AllXamarinFrameworks)</SupportedFramework>
+    </ProjectReference>
     <HarvestIncludePaths Include="lib/net46;runtimes/win/lib/net46" />
-    <HarvestIncludePaths Include="ref/netstandard1.3">
-      <SupportedFramework>netcore50</SupportedFramework>
-    </HarvestIncludePaths>
     <HarvestIncludePaths Include="runtimes/win/lib/netstandard1.3;lib/netstandard1.3" />
   </ItemGroup>
+  <PropertyGroup>
+    <!-- Excluding the reference assets on the package so that RAR will see the run-time conflicts at build time in order to
+    generate the right binding redirects when targeting Desktop. https://github.com/dotnet/corefx/issues/32457 -->
+    <ExcludeReferenceAssets>true</ExcludeReferenceAssets>
+  </PropertyGroup>
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), Directory.Build.targets))\Directory.Build.targets" />
 </Project>
\ No newline at end of file
diff --git a/src/System.Text.Encoding.CodePages/pkg/System.Text.Encoding.CodePages.pkgproj b/src/System.Text.Encoding.CodePages/pkg/System.Text.Encoding.CodePages.pkgproj
index f16c19c14865..60c8b6953a67 100644
--- a/src/System.Text.Encoding.CodePages/pkg/System.Text.Encoding.CodePages.pkgproj
+++ b/src/System.Text.Encoding.CodePages/pkg/System.Text.Encoding.CodePages.pkgproj
@@ -7,7 +7,7 @@
     </ProjectReference>
     <ProjectReference Include="..\src\System.Text.Encoding.CodePages.csproj" />
     <HarvestIncludePaths Include="lib/net46" />
-    <HarvestIncludePaths Include="ref/netstandard1.3;runtimes/win/lib/netstandard1.3;lib/netstandard1.3" />
+    <HarvestIncludePaths Include="runtimes/win/lib/netstandard1.3;lib/netstandard1.3" />
   </ItemGroup>
   <ItemGroup>
     <InboxOnTargetFramework Include="MonoAndroid10" />
@@ -26,5 +26,10 @@
       <Value>.NETCoreApp;UAP</Value>
     </ValidatePackageSuppression>
   </ItemGroup>
+  <PropertyGroup>
+    <!-- Excluding the reference assets on the package so that RAR will see the run-time conflicts at build time in order to
+    generate the right binding redirects when targeting Desktop. https://github.com/dotnet/corefx/issues/32457 -->
+    <ExcludeReferenceAssets>true</ExcludeReferenceAssets>
+  </PropertyGroup>
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), Directory.Build.targets))\Directory.Build.targets" />
 </Project>
\ No newline at end of file
diff --git a/src/System.Threading.Tasks.Extensions/pkg/System.Threading.Tasks.Extensions.pkgproj b/src/System.Threading.Tasks.Extensions/pkg/System.Threading.Tasks.Extensions.pkgproj
index 102d36f3f3c9..b0e220c017ce 100644
--- a/src/System.Threading.Tasks.Extensions/pkg/System.Threading.Tasks.Extensions.pkgproj
+++ b/src/System.Threading.Tasks.Extensions/pkg/System.Threading.Tasks.Extensions.pkgproj
@@ -19,5 +19,10 @@
          therefore it cannot reference NETStandard.Library -->
     <SuppressMetaPackage Include="NETStandard.Library" />
   </ItemGroup>
+  <PropertyGroup>
+    <!-- Excluding the reference assets on the package so that RAR will see the run-time conflicts at build time in order to
+    generate the right binding redirects when targeting Desktop. https://github.com/dotnet/corefx/issues/32457 -->
+    <ExcludeReferenceAssets>true</ExcludeReferenceAssets>
+  </PropertyGroup>
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), Directory.Build.targets))\Directory.Build.targets" />
 </Project>