Targeting multiple frameworks

DOCX/DOCX.csproj

@@ -1,11 +1,14 @@
 <Project Sdk="Microsoft.NET.Sdk">
+	<PropertyGroup>
+		<TargetFrameworks>netcoreapp3.1;net472</TargetFrameworks>
+	</PropertyGroup>
 
-    <PropertyGroup>
-        <TargetFramework>netcoreapp3.1</TargetFramework>
-    </PropertyGroup>
-
-    <ItemGroup>
-      <PackageReference Include="Newtonsoft.Json" Version="11.0.2" />
-    </ItemGroup>
+	<ItemGroup>
+		<PackageReference Include="Newtonsoft.Json" Version="11.0.2" />
+	</ItemGroup>
 
+	<ItemGroup Condition=" '$(TargetFramework)' == 'net472' ">
+		<Reference Include="System.IO.Compression" />
+		<Reference Include="System.IO.Compression.FileSystem" />
+	</ItemGroup>
 </Project>