diff --git a/demo/Web.config b/demo/Web.config
index 6b57f21d..1006022a 100644
--- a/demo/Web.config
+++ b/demo/Web.config
@@ -8,6 +8,7 @@
   <!-- Register MIME type for cache manifest -->
   <system.webServer>
     <staticContent>
+      <remove fileExtension=".appcache"/>
       <mimeMap fileExtension=".appcache" mimeType="text/cache-manifest"/>
     </staticContent>
   </system.webServer>