diff --git a/src/Directory.props b/src/Directory.props
index ea61fb05..b0630fe3 100644
--- a/src/Directory.props
+++ b/src/Directory.props
@@ -6,6 +6,7 @@
     <PackOnBuild>true</PackOnBuild>
     <PackFolder>analyzers/dotnet/cs</PackFolder>
     <GenerateDocumentationFile>false</GenerateDocumentationFile>
+    <RestoreSources>https://api.nuget.org/v3/index.json</RestoreSources>
     <RestoreSources Condition="Exists('$(MSBuildThisFileDirectory)..\..\nugetizer\bin\')">$([System.IO.Path]::GetFullPath('$(MSBuildThisFileDirectory)..\..\nugetizer\bin'));$(RestoreSources)</RestoreSources>
 
     <PackageProjectUrl>https://clarius.org/ThisAssembly</PackageProjectUrl>
diff --git a/src/ThisAssembly.Resources/ResourcesGenerator.cs b/src/ThisAssembly.Resources/ResourcesGenerator.cs
index ea1e3d60..adc6a661 100644
--- a/src/ThisAssembly.Resources/ResourcesGenerator.cs
+++ b/src/ThisAssembly.Resources/ResourcesGenerator.cs
@@ -1,5 +1,5 @@
 using System;
-using System.Collections.Immutable;
+using System.Collections.Generic;
 using System.IO;
 using System.Linq;
 using System.Text;
@@ -35,8 +35,11 @@ public void Initialize(IncrementalGeneratorInitializationContext context)
                 .Combine(context.AnalyzerConfigOptionsProvider
                     .Select((p, _) =>
                     {
-                        p.GlobalOptions.TryGetValue("build_property.EmbeddedResourceStringExtensions", out var extensions);
-                        return extensions!;
+                        if (!p.GlobalOptions.TryGetValue("build_property.EmbeddedResourceStringExtensions", out var extensions) ||
+                            extensions == null)
+                            return new HashSet<string>();
+
+                        return new HashSet<string>(extensions.Split('|'), StringComparer.OrdinalIgnoreCase);
                     }));
 
             context.RegisterSourceOutput(
@@ -44,15 +47,15 @@ public void Initialize(IncrementalGeneratorInitializationContext context)
                 GenerateSource);
         }
 
-        static void GenerateSource(SourceProductionContext spc, ((string resourceName, string? kind, string? comment), string extensions) arg2)
+        static void GenerateSource(SourceProductionContext spc, ((string resourceName, string? kind, string? comment), HashSet<string> extensions) arg2)
         {
             var ((resourceName, kind, comment), extensions) = arg2;
 
             var file = "CSharp.sbntxt";
             var template = Template.Parse(EmbeddedResource.GetContent(file), file);
 
-            var isText = kind != null && kind.Equals("text", StringComparison.OrdinalIgnoreCase)
-                || extensions.Split(';').Contains(Path.GetFileName(resourceName));
+            var isText = kind?.Equals("text", StringComparison.OrdinalIgnoreCase) == true ||
+                extensions.Contains(Path.GetExtension(resourceName));
             var root = Area.Load(new Resource(resourceName, comment, isText));
             var model = new Model(root);
 
diff --git a/src/ThisAssembly.Resources/ThisAssembly.Resources.props b/src/ThisAssembly.Resources/ThisAssembly.Resources.props
index d4a06db1..2107582d 100644
--- a/src/ThisAssembly.Resources/ThisAssembly.Resources.props
+++ b/src/ThisAssembly.Resources/ThisAssembly.Resources.props
@@ -1,7 +1,7 @@
 <Project>
 
   <PropertyGroup>
-    <EmbeddedResourceStringExtensions>.txt;.cs;.sql;.json;.md;</EmbeddedResourceStringExtensions>
+    <EmbeddedResourceStringExtensions>.txt|.cs|.sql|.json|.md;</EmbeddedResourceStringExtensions>
   </PropertyGroup>
 
 </Project>