Index: server-coreless/src/main/java/org/openqa/selenium/server/browserlaunchers/HTABrowserLauncher.java
===================================================================
--- server-coreless/src/main/java/org/openqa/selenium/server/browserlaunchers/HTABrowserLauncher.java	(revision 2261)
+++ server-coreless/src/main/java/org/openqa/selenium/server/browserlaunchers/HTABrowserLauncher.java	(working copy)
@@ -91,6 +91,12 @@
             File testRunnerDest = new File(coreDir, "TestRunner.hta");
             f.copyFile(selRunnerSrc, selRunnerDest);
             f.copyFile(testRunnerSrc, testRunnerDest);
+	    // custom user-extensions
+            File userExt = this.configuration.getUserExtensions();
+            if (userExt != null) {
+                File selUserExt = new File(coreDir, "scripts/user-extensions.js");
+                f.copyFile(userExt, selUserExt, null, true);
+            }
         } catch (IOException e) {
             throw new RuntimeException(e);
         }