diff --git a/Source/src/WixSharp.Samples/Wix# Samples/testpad/setup.cs b/Source/src/WixSharp.Samples/Wix# Samples/testpad/setup.cs
index 43a1be5e..a21f3d77 100644
--- a/Source/src/WixSharp.Samples/Wix# Samples/testpad/setup.cs	
+++ b/Source/src/WixSharp.Samples/Wix# Samples/testpad/setup.cs	
@@ -18,6 +18,8 @@ static class Script
 {
     static public void Main()
     {
+        var ttt = WixTools.FindWixExtensionDll("WixToolset.UI.wixext");
+        return;
         Feature poFeature = new Feature("PO", "PO", "INSTALLDIR");
 
         var project = new ManagedProject("My Product",
diff --git a/Source/src/WixSharp.Samples/Wix# Samples/testpad/testpad.csproj b/Source/src/WixSharp.Samples/Wix# Samples/testpad/testpad.csproj
index 6eaa83cf..70144d97 100644
--- a/Source/src/WixSharp.Samples/Wix# Samples/testpad/testpad.csproj	
+++ b/Source/src/WixSharp.Samples/Wix# Samples/testpad/testpad.csproj	
@@ -21,6 +21,7 @@
 
   <ItemGroup>
     <PackageReference Include="WixToolset.Dtf.WindowsInstaller" Version="4.0.2" />
+    <PackageReference Include="WixToolset.UI.wixext" Version="5.0.1" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/Source/src/WixSharp/Utilities/WixTools.cs b/Source/src/WixSharp/Utilities/WixTools.cs
index eb416887..b3606563 100644
--- a/Source/src/WixSharp/Utilities/WixTools.cs
+++ b/Source/src/WixSharp/Utilities/WixTools.cs
@@ -324,11 +324,13 @@ static public string FindWixExtensionDll(string name, string version = null)
 
         static string FindWixExtensionDll(string extensionDir, string name, string version)
         {
+            if (!extensionDir.PathCombine(name).PathExists())
+                return null;
+
             // C:\Users\user\.wix\extensions\WixToolset.UI.wixext\5.0.0\wixext5\WixToolset.UI.wixext.dll
             // C:\Users\user\.wix\extensions\WixToolset.UI.wixext\4.0.4\wixext4\WixToolset.UI.wixext.dll
             // C:\Users\user\.wix\extensions\WixToolset.Bal.wixext\4.0.2\wixext4\WixToolset.Bal.wixext.dll
             // C:\Users\user\.wix\extensions\WixToolset.Bal.wixext\5.0.0\wixext5\WixToolset.BootstrapperApplications.wixext.dll
-
             var candidates = Directory
                              .GetDirectories(extensionDir.PathCombine(name))
                              .Select(x => new