In version 8.0.1.2 this is on line 142 by default...immediately after the urlrewrites section and immediately before the assemblies section
Code:
<rule url="/x-(.*?)\.aspx(?:\?(.*))?" rewrite="/execpackage.aspx?XmlPackage=$1&$2" />
</urlrewrites>
<!-- DYNAMIC DEBUG COMPILATION: Set compilation debug="true" to enable ASPX debugging. Otherwise, "false" will improve runtime performance of this application. -->
<compilation defaultLanguage="c#" debug="true">
<assemblies>
<!-- WSI Web Service Interface (Section 3 of 4) Uncomment the following line to enable WSI Web Service Interface -->
<!--
<add assembly="Microsoft.Web.Services3, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
-->
<add assembly="System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
<add assembly="System.Configuration, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A" />