diff --git a/src/Core/WinSWCore/Configuration/YamlExtensionConfiguration.cs b/src/Core/WinSWCore/Configuration/YamlExtensionConfiguration.cs
index cfc4a6f..3d72cc3 100644
--- a/src/Core/WinSWCore/Configuration/YamlExtensionConfiguration.cs
+++ b/src/Core/WinSWCore/Configuration/YamlExtensionConfiguration.cs
@@ -9,7 +9,7 @@ namespace WinSW.Configuration
         [YamlMember(Alias = "id")]
         public string? ExtensionId { get; set; }
 
-        [YamlMember(Alias = "classname")]
+        [YamlMember(Alias = "className")]
         public string? ExtensionClassName { get; set; }
 
         [YamlMember(Alias = "enabled")]
diff --git a/src/Test/winswTests/Extensions/RunawayProcessKillerTest.cs b/src/Test/winswTests/Extensions/RunawayProcessKillerTest.cs
index ae86acc..dea027a 100644
--- a/src/Test/winswTests/Extensions/RunawayProcessKillerTest.cs
+++ b/src/Test/winswTests/Extensions/RunawayProcessKillerTest.cs
@@ -56,7 +56,7 @@ arguments: >-
 extensions:
     - id: killRunawayProcess
       enabled: yes
-      classname: ""{this.testExtension}""
+      className: ""{this.testExtension}""
       settings:
             pidfile: 'foo/bar/pid.txt'
             stopTimeOut: 5000
diff --git a/src/Test/winswTests/Extensions/SharedDirectoryMapperTest.cs b/src/Test/winswTests/Extensions/SharedDirectoryMapperTest.cs
index e0217a4..3b0136c 100644
--- a/src/Test/winswTests/Extensions/SharedDirectoryMapperTest.cs
+++ b/src/Test/winswTests/Extensions/SharedDirectoryMapperTest.cs
@@ -1,5 +1,6 @@
 using NUnit.Framework;
 using WinSW;
+using WinSW.Configuration;
 using WinSW.Extensions;
 using WinSW.Plugins.SharedDirectoryMapper;
 
@@ -8,7 +9,8 @@ namespace winswTests.Extensions
     [TestFixture]
     class SharedDirectoryMapperTest : ExtensionTestBase
     {
-        ServiceDescriptor _testServiceDescriptor;
+        IWinSWConfiguration _testServiceDescriptor;
+        IWinSWConfiguration _testServiceDescriptorYaml;
 
         readonly string testExtension = GetExtensionClassNameWithAssembly(typeof(SharedDirectoryMapper));
 
@@ -39,6 +41,44 @@ $@"<service>
   </extensions>
 </service>";
             this._testServiceDescriptor = ServiceDescriptor.FromXML(seedXml);
+
+            string seedYaml = $@"---
+id: jenkins
+name: Jenkins
+description: This service runs Jenkins automation server.
+env:
+    -
+        name: JENKINS_HOME
+        value: '%LocalAppData%\Jenkins.jenkins'
+executable: java
+arguments: >-
+    -Xrs -Xmx256m -Dhudson.lifecycle=hudson.lifecycle.WindowsServiceLifecycle
+    -jar E:\Winsw Test\yml6\jenkins.war --httpPort=8081
+extensions:
+    - id: mapNetworDirs
+      className: ""{this.testExtension}""
+      enabled: true
+      settings:
+          mapping: 
+              - enabled: false
+                label: N
+                uncpath: \\UNC
+              - enabled: false
+                label: M
+                uncpath: \\UNC2
+    - id: mapNetworDirs2
+      className: ""{this.testExtension}""
+      enabled: true
+      settings:
+          mapping: 
+              - enabled: false
+                label: X
+                uncpath: \\UNC
+              - enabled: false
+                label: Y
+                uncpath: \\UNC2";
+
+            this._testServiceDescriptorYaml = ServiceDescriptorYaml.FromYaml(seedYaml).Configurations;
         }
 
         [Test]
@@ -49,6 +89,14 @@ $@"<service>
             Assert.AreEqual(2, manager.Extensions.Count, "Two extensions should be loaded");
         }
 
+        [Test]
+        public void LoadExtensionsYaml()
+        {
+            WinSWExtensionManager manager = new WinSWExtensionManager(this._testServiceDescriptorYaml);
+            manager.LoadExtensions();
+            Assert.AreEqual(2, manager.Extensions.Count, "Two extensions should be loaded");
+        }
+
         [Test]
         public void StartStopExtension()
         {