Use Microsoft.NETFramework.ReferenceAssemblies

SimpleWavSplitter.sln

@@ -37,6 +37,7 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "props", "props", "{335EB7D0
 		build\Avalonia.props = build\Avalonia.props
 		build\Base.props = build\Base.props
 		build\EmbedXaml.props = build\EmbedXaml.props
+		build\ReferenceAssemblies.props = build\ReferenceAssemblies.props
 		build\Rx.props = build\Rx.props
 		build\System.IO.FileSystem.props = build\System.IO.FileSystem.props
 		build\XUnit.props = build\XUnit.props

build/ReferenceAssemblies.props

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NETFramework.ReferenceAssemblies" Version="1.0.0-preview.1" />
+  </ItemGroup>
+</Project>

src/SimpleWavSplitter.Avalonia/SimpleWavSplitter.Avalonia.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>netcoreapp3.0</TargetFramework>
+    <TargetFramework>netcoreapp3.0;net461</TargetFramework>
     <OutputType>WinExe</OutputType>
     <GeneratePackageOnBuild>False</GeneratePackageOnBuild>
     <EnableDefaultCompileItems>False</EnableDefaultCompileItems>
@@ -15,6 +15,7 @@
   </PropertyGroup>
 
   <Import Project="..\..\build\Base.props" />
+  <Import Project="..\..\build\ReferenceAssemblies.props" />
   <Import Project="..\..\build\Rx.props" />
   <Import Project="..\..\build\Avalonia.props" />
   <Import Project="..\..\build\Avalonia.Desktop.props" />

src/SimpleWavSplitter.Console/SimpleWavSplitter.Console.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>netcoreapp3.0</TargetFramework>
+    <TargetFramework>netcoreapp3.0;net461</TargetFramework>
     <OutputType>Exe</OutputType>
     <GeneratePackageOnBuild>False</GeneratePackageOnBuild>
     <EnableDefaultCompileItems>False</EnableDefaultCompileItems>
@@ -15,6 +15,7 @@
   </PropertyGroup>
 
   <Import Project="..\..\build\Base.props" />
+  <Import Project="..\..\build\ReferenceAssemblies.props" />
 
   <ItemGroup>
     <Compile Include="**\*.cs" Exclude="obj\**" />

src/WavFile/WavFile.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>netstandard2.0</TargetFrameworks>
+    <TargetFrameworks>netstandard2.0;net461</TargetFrameworks>
     <OutputType>Library</OutputType>
     <EnableDefaultCompileItems>False</EnableDefaultCompileItems>
     <GeneratePackageOnBuild>False</GeneratePackageOnBuild>
@@ -15,6 +15,7 @@
   </PropertyGroup>
 
   <Import Project="..\..\build\Base.props" />
+  <Import Project="..\..\build\ReferenceAssemblies.props" />
 
   <ItemGroup>
     <Compile Include="**\*.cs" Exclude="obj\**" />