diff --git a/CSharp/V5/Applications/UniversalEditor.Bootstrapper/App.config b/CSharp/V5/Applications/UniversalEditor.Bootstrapper/App.config
index 3f3aad40..b9c33220 100644
--- a/CSharp/V5/Applications/UniversalEditor.Bootstrapper/App.config
+++ b/CSharp/V5/Applications/UniversalEditor.Bootstrapper/App.config
@@ -1,8 +1,14 @@
 <?xml version="1.0"?>
 <configuration>
-  <runtime>
-    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
-      <probing privatePath="Plugins"/>
-    </assemblyBinding>
-  </runtime>
-<startup><supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/></startup></configuration>
+	<appSettings>
+		<add key="UniversalEditor.Configuration.ConfigurationFileNameFilter" value="*.uexml" />
+	</appSettings>
+	<runtime>
+		<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
+			<probing privatePath="Plugins"/>
+		</assemblyBinding>
+	</runtime>
+	<startup>
+		<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/>
+	</startup>
+</configuration>
diff --git a/CSharp/V5/Applications/UniversalEditor.ConsoleBootstrapper/App.config b/CSharp/V5/Applications/UniversalEditor.ConsoleBootstrapper/App.config
index 3f3aad40..b9c33220 100644
--- a/CSharp/V5/Applications/UniversalEditor.ConsoleBootstrapper/App.config
+++ b/CSharp/V5/Applications/UniversalEditor.ConsoleBootstrapper/App.config
@@ -1,8 +1,14 @@
 <?xml version="1.0"?>
 <configuration>
-  <runtime>
-    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
-      <probing privatePath="Plugins"/>
-    </assemblyBinding>
-  </runtime>
-<startup><supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/></startup></configuration>
+	<appSettings>
+		<add key="UniversalEditor.Configuration.ConfigurationFileNameFilter" value="*.uexml" />
+	</appSettings>
+	<runtime>
+		<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
+			<probing privatePath="Plugins"/>
+		</assemblyBinding>
+	</runtime>
+	<startup>
+		<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/>
+	</startup>
+</configuration>