diff --git a/Frameworks/Core/ERExtensions/Sources/er/extensions/appserver/ERXApplication.java b/Frameworks/Core/ERExtensions/Sources/er/extensions/appserver/ERXApplication.java
index 0a02f6b443b..1e71fd4856c 100644
--- a/Frameworks/Core/ERExtensions/Sources/er/extensions/appserver/ERXApplication.java
+++ b/Frameworks/Core/ERExtensions/Sources/er/extensions/appserver/ERXApplication.java
@@ -176,6 +176,9 @@ public abstract class ERXApplication extends ERXAjaxApplication implements ERXGr
 
 	private static boolean wasERXApplicationMainInvoked = false;
 
+	/** empty array for adaptorExtensions */
+    private static String[] myAppExtensions = {};
+
 	/**
 	 * Notification to get posted when we get an OutOfMemoryError or when memory passes
 	 * the low memory threshold set in er.extensions.ERXApplication.memoryLowThreshold. 
@@ -2895,4 +2898,13 @@ public void terminate() {
 		NSNotificationCenter.defaultCenter().postNotification(ApplicationWillTerminateNotification, this);
 		super.terminate();
 	}
+	
+	/**
+	 * Override default implementation that returns {".dll", ".exe"} and therefor prohibits IIS
+	 * as WebServer.
+	 */
+	@Override
+    public String[] adaptorExtensions() {
+        return myAppExtensions;
+    }
 }