原因:IIS未設定支援XAP格式檔案
解決方法:在IIS中,添加MIME類型.xaml application/xaml+xml .xap application/x-silverlight-app
Reference:http://blogs.msdn.com/tims/archive/2008/03/18/configuring-a-web-server-to-host-silverlight-content.aspx