diff --git a/src/Razor/Microsoft.NET.Sdk.Razor/src/build/netstandard2.0/Microsoft.NET.Sdk.Razor.Compilation.targets b/src/Razor/Microsoft.NET.Sdk.Razor/src/build/netstandard2.0/Microsoft.NET.Sdk.Razor.Compilation.targets
index 487ffb348a..aa36ef1d3e 100644
--- a/src/Razor/Microsoft.NET.Sdk.Razor/src/build/netstandard2.0/Microsoft.NET.Sdk.Razor.Compilation.targets
+++ b/src/Razor/Microsoft.NET.Sdk.Razor/src/build/netstandard2.0/Microsoft.NET.Sdk.Razor.Compilation.targets
@@ -114,7 +114,7 @@ Copyright (c) .NET Foundation. All rights reserved.
     <PropertyGroup>
       <LangVersion Condition="'$(LangVersion)' == '' AND
         (('$(TargetFrameworkIdentifier)' == '.NETCoreApp' AND '$(TargetFrameworkVersion)' == 'v3.0') OR
-         ('$(TargetFrameworkIdentifier)' == '.NETStandard' AND '$(TargetFrameworkVersion)' == 'v2.1'))">8.0</LangVersion>
+         ('$(TargetFrameworkIdentifier)' == '.NETStandard' AND '$(TargetFrameworkVersion)' == 'v2.1'))">preview</LangVersion>
     </PropertyGroup>
 
     <Csc
diff --git a/src/Razor/Microsoft.NET.Sdk.Razor/test/IntegrationTests/DesignTimeBuildIntegrationTest.cs b/src/Razor/Microsoft.NET.Sdk.Razor/test/IntegrationTests/DesignTimeBuildIntegrationTest.cs
index 2c14663f4d..f5baa8b4b9 100644
--- a/src/Razor/Microsoft.NET.Sdk.Razor/test/IntegrationTests/DesignTimeBuildIntegrationTest.cs
+++ b/src/Razor/Microsoft.NET.Sdk.Razor/test/IntegrationTests/DesignTimeBuildIntegrationTest.cs
@@ -77,8 +77,8 @@ namespace Microsoft.AspNetCore.Razor.Design.IntegrationTests
 
             var filePaths = new string[]
             {
-                Path.Combine("MyComponent.cshtml"),
                 Path.Combine("GenericComponent.razor"),
+                Path.Combine("MyComponent.razor"),
             };
 
             foreach (var filePath in filePaths)
diff --git a/src/Razor/test/testassets/AppWithP2PReference/AppWithP2PReference.csproj b/src/Razor/test/testassets/AppWithP2PReference/AppWithP2PReference.csproj
index 45907b402f..d5034c583f 100644
--- a/src/Razor/test/testassets/AppWithP2PReference/AppWithP2PReference.csproj
+++ b/src/Razor/test/testassets/AppWithP2PReference/AppWithP2PReference.csproj
@@ -5,18 +5,14 @@
   </PropertyGroup>
 
   <PropertyGroup>
-    <DisableImplicitFrameworkReferences>true</DisableImplicitFrameworkReferences>
-    <AddRazorSupportForMvc>true</AddRazorSupportForMvc>
+    <TargetFramework>netcoreapp3.0</TargetFramework>
   </PropertyGroup>
 
   <ItemGroup>
-    <FrameworkReference Include="Microsoft.NETCore.App" />
+    <!-- Avoid referencing the AspNetCore framework since we want the ability to target work-in-progress shims -->
+    <FrameworkReference Remove="Microsoft.AspNetCore.App" />
   </ItemGroup>
 
-  <PropertyGroup>
-    <TargetFramework>netcoreapp3.0</TargetFramework>
-  </PropertyGroup>
-
   <PropertyGroup Condition="'$(RunningAsTest)' == ''">
     <!-- We don't want to run build server when not running as tests. -->
     <UseRazorBuildServer>false</UseRazorBuildServer>
diff --git a/src/Razor/test/testassets/ClassLibrary/ClassLibrary.csproj b/src/Razor/test/testassets/ClassLibrary/ClassLibrary.csproj
index 4e4b461927..57ca5669a8 100644
--- a/src/Razor/test/testassets/ClassLibrary/ClassLibrary.csproj
+++ b/src/Razor/test/testassets/ClassLibrary/ClassLibrary.csproj
@@ -4,19 +4,10 @@
     <RazorSdkDirectoryRoot>$(RazorSdkArtifactsDirectory)$(Configuration)\sdk-output\</RazorSdkDirectoryRoot>
   </PropertyGroup>
 
-  <!--
-  The AspNetCore repo depends on AspNetCore-Tooling, and we want to avoid creating a cylical dependency between the two
-  by adding a reference to Microsoft.AspNetCore.App. We'll instead simulate the presence of the reference.
-  -->
   <PropertyGroup>
-    <DisableImplicitFrameworkReferences>true</DisableImplicitFrameworkReferences>
     <AddRazorSupportForMvc>true</AddRazorSupportForMvc>
   </PropertyGroup>
 
-  <ItemGroup>
-    <FrameworkReference Include="Microsoft.NETCore.App" />
-  </ItemGroup>
-
   <PropertyGroup>
     <TargetFramework>netcoreapp3.0</TargetFramework>
     <Copyright>© Microsoft</Copyright>
diff --git a/src/Razor/test/testassets/ClassLibrary2/ClassLibrary2.csproj b/src/Razor/test/testassets/ClassLibrary2/ClassLibrary2.csproj
index f07e194311..8ba54d6c98 100644
--- a/src/Razor/test/testassets/ClassLibrary2/ClassLibrary2.csproj
+++ b/src/Razor/test/testassets/ClassLibrary2/ClassLibrary2.csproj
@@ -4,17 +4,9 @@
     <RazorSdkDirectoryRoot>$(RazorSdkArtifactsDirectory)$(Configuration)\sdk-output\</RazorSdkDirectoryRoot>
   </PropertyGroup>
 
-  <PropertyGroup>
-    <DisableImplicitFrameworkReferences>true</DisableImplicitFrameworkReferences>
-    <AddRazorSupportForMvc>true</AddRazorSupportForMvc>
-  </PropertyGroup>
-
-  <ItemGroup>
-    <FrameworkReference Include="Microsoft.NETCore.App" />
-  </ItemGroup>
-
   <PropertyGroup>
     <TargetFramework>netcoreapp3.0</TargetFramework>
+    <AddRazorSupportForMvc>true</AddRazorSupportForMvc>
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(RunningAsTest)' == ''">
diff --git a/src/Razor/test/testassets/ComponentApp/ComponentApp.csproj b/src/Razor/test/testassets/ComponentApp/ComponentApp.csproj
index 2e01f4b269..68b1028aa0 100644
--- a/src/Razor/test/testassets/ComponentApp/ComponentApp.csproj
+++ b/src/Razor/test/testassets/ComponentApp/ComponentApp.csproj
@@ -2,17 +2,15 @@
 
   <PropertyGroup>
     <RazorSdkDirectoryRoot>$(RazorSdkArtifactsDirectory)$(Configuration)\sdk-output\</RazorSdkDirectoryRoot>
-    <AddRazorSupportForMvc>true</AddRazorSupportForMvc>
   </PropertyGroup>
 
   <PropertyGroup>
     <TargetFramework>netcoreapp3.0</TargetFramework>
-    <DisableImplicitFrameworkReferences>true</DisableImplicitFrameworkReferences>
-    <LangVersion>8.0</LangVersion>
   </PropertyGroup>
 
   <ItemGroup>
-    <FrameworkReference Include="Microsoft.NETCore.App" />
+    <!-- Avoid referencing the AspNetCore framework since we want the ability to target work-in-progress shims -->
+    <FrameworkReference Remove="Microsoft.AspNetCore.App" />
   </ItemGroup>
 
   <PropertyGroup Condition="'$(RunningAsTest)' == ''">
diff --git a/src/Razor/test/testassets/ComponentLibrary/ComponentLibrary.csproj b/src/Razor/test/testassets/ComponentLibrary/ComponentLibrary.csproj
index e695e52b28..06baf7f0ad 100644
--- a/src/Razor/test/testassets/ComponentLibrary/ComponentLibrary.csproj
+++ b/src/Razor/test/testassets/ComponentLibrary/ComponentLibrary.csproj
@@ -2,7 +2,6 @@
   
   <PropertyGroup>
     <RazorSdkDirectoryRoot>$(RazorSdkArtifactsDirectory)$(Configuration)\sdk-output\</RazorSdkDirectoryRoot>
-    <_RazorComponentInclude>**\*.cshtml</_RazorComponentInclude>
   </PropertyGroup>
 
   <PropertyGroup>
diff --git a/src/Razor/test/testassets/ComponentLibrary/MyComponent.cshtml b/src/Razor/test/testassets/ComponentLibrary/MyComponent.razor
similarity index 100%
rename from src/Razor/test/testassets/ComponentLibrary/MyComponent.cshtml
rename to src/Razor/test/testassets/ComponentLibrary/MyComponent.razor
diff --git a/src/Razor/test/testassets/MvcWithComponents/Components/Counter.cshtml b/src/Razor/test/testassets/MvcWithComponents/Components/Counter.razor
similarity index 100%
rename from src/Razor/test/testassets/MvcWithComponents/Components/Counter.cshtml
rename to src/Razor/test/testassets/MvcWithComponents/Components/Counter.razor
diff --git a/src/Razor/test/testassets/MvcWithComponents/MvcWithComponents.csproj b/src/Razor/test/testassets/MvcWithComponents/MvcWithComponents.csproj
index d225ac2239..31429c409f 100644
--- a/src/Razor/test/testassets/MvcWithComponents/MvcWithComponents.csproj
+++ b/src/Razor/test/testassets/MvcWithComponents/MvcWithComponents.csproj
@@ -2,22 +2,17 @@
 
   <PropertyGroup>
     <RazorSdkDirectoryRoot>$(RazorSdkArtifactsDirectory)$(Configuration)\sdk-output\</RazorSdkDirectoryRoot>
-    <_RazorComponentInclude>Components\**\*.cshtml</_RazorComponentInclude>
   </PropertyGroup>
 
-  <PropertyGroup>
-    <DisableImplicitFrameworkReferences>true</DisableImplicitFrameworkReferences>
-    <AddRazorSupportForMvc>true</AddRazorSupportForMvc>
-  </PropertyGroup>
-
-  <ItemGroup>
-    <FrameworkReference Include="Microsoft.NETCore.App" />
-  </ItemGroup>
-
   <PropertyGroup>
     <TargetFramework>netcoreapp3.0</TargetFramework>
   </PropertyGroup>
 
+  <ItemGroup>
+    <!-- Avoid referencing the AspNetCore framework since we want the ability to target work-in-progress shims -->
+    <FrameworkReference Remove="Microsoft.AspNetCore.App" />
+  </ItemGroup>
+
   <PropertyGroup Condition="'$(RunningAsTest)' == ''">
     <!-- We don't want to run build server when not running as tests. -->
     <UseRazorBuildServer>false</UseRazorBuildServer>
diff --git a/src/Razor/test/testassets/SimpleMvc/SimpleMvc.csproj b/src/Razor/test/testassets/SimpleMvc/SimpleMvc.csproj
index 13621d0e0c..1cde2c2ba5 100644
--- a/src/Razor/test/testassets/SimpleMvc/SimpleMvc.csproj
+++ b/src/Razor/test/testassets/SimpleMvc/SimpleMvc.csproj
@@ -5,18 +5,14 @@
   </PropertyGroup>
 
   <PropertyGroup>
-    <DisableImplicitFrameworkReferences>true</DisableImplicitFrameworkReferences>
-    <AddRazorSupportForMvc>true</AddRazorSupportForMvc>
+    <TargetFramework>netcoreapp3.0</TargetFramework>
   </PropertyGroup>
 
   <ItemGroup>
-    <FrameworkReference Include="Microsoft.NETCore.App" />
+    <!-- Avoid referencing the AspNetCore framework since we want the ability to target work-in-progress shims -->
+    <FrameworkReference Remove="Microsoft.AspNetCore.App" />
   </ItemGroup>
 
-  <PropertyGroup>
-    <TargetFramework>netcoreapp3.0</TargetFramework>
-  </PropertyGroup>
-
   <PropertyGroup Condition="'$(RunningAsTest)' == ''">
     <!-- We don't want to run build server when not running as tests. -->
     <UseRazorBuildServer>false</UseRazorBuildServer>
diff --git a/src/Razor/test/testassets/SimpleMvcFSharp/SimpleMvcFSharp.fsproj b/src/Razor/test/testassets/SimpleMvcFSharp/SimpleMvcFSharp.fsproj
index b4a810124c..611e331385 100644
--- a/src/Razor/test/testassets/SimpleMvcFSharp/SimpleMvcFSharp.fsproj
+++ b/src/Razor/test/testassets/SimpleMvcFSharp/SimpleMvcFSharp.fsproj
@@ -5,17 +5,14 @@
   </PropertyGroup>
 
   <PropertyGroup>
-    <DisableImplicitFrameworkReferences>true</DisableImplicitFrameworkReferences>
+    <TargetFramework>netcoreapp3.0</TargetFramework>
   </PropertyGroup>
 
   <ItemGroup>
-    <FrameworkReference Include="Microsoft.NETCore.App" />
+    <!-- Avoid referencing the AspNetCore framework since we want the ability to target work-in-progress shims -->
+    <FrameworkReference Remove="Microsoft.AspNetCore.App" />
   </ItemGroup>
 
-  <PropertyGroup>
-    <TargetFramework>netcoreapp3.0</TargetFramework>
-  </PropertyGroup>
-
   <PropertyGroup Condition="'$(RunningAsTest)' == ''">
     <!-- We don't want to run build server when not running as tests. -->
     <UseRazorBuildServer>false</UseRazorBuildServer>
diff --git a/src/Razor/test/testassets/SimplePages/SimplePages.csproj b/src/Razor/test/testassets/SimplePages/SimplePages.csproj
index 13621d0e0c..1cde2c2ba5 100644
--- a/src/Razor/test/testassets/SimplePages/SimplePages.csproj
+++ b/src/Razor/test/testassets/SimplePages/SimplePages.csproj
@@ -5,18 +5,14 @@
   </PropertyGroup>
 
   <PropertyGroup>
-    <DisableImplicitFrameworkReferences>true</DisableImplicitFrameworkReferences>
-    <AddRazorSupportForMvc>true</AddRazorSupportForMvc>
+    <TargetFramework>netcoreapp3.0</TargetFramework>
   </PropertyGroup>
 
   <ItemGroup>
-    <FrameworkReference Include="Microsoft.NETCore.App" />
+    <!-- Avoid referencing the AspNetCore framework since we want the ability to target work-in-progress shims -->
+    <FrameworkReference Remove="Microsoft.AspNetCore.App" />
   </ItemGroup>
 
-  <PropertyGroup>
-    <TargetFramework>netcoreapp3.0</TargetFramework>
-  </PropertyGroup>
-
   <PropertyGroup Condition="'$(RunningAsTest)' == ''">
     <!-- We don't want to run build server when not running as tests. -->
     <UseRazorBuildServer>false</UseRazorBuildServer>