Missing SSIS Extension in Config Files

As I understand it, in order to use an SSIS package as a data source in a report, I need to enable the SSIS extension in the RSReprotDesigner.config and RSReportServer.config files.  That extension is in neither of these files. I have SSIS running on my machine with Reporting Services.

The path to RSReportServer.config: C:\Program Files\Microsoft SQL Server\MSRS10_50.MSSQLSERVER\Reporting Services\ReportServer

The path to RSReportDesigner.config: C:\Program Files (x86)\Microsoft Visual Studio 9.0\Common7\IDE\PrivateAssemblies

Why is this extension not in either of these files?

The following is an abbreviated list of what's present in the RSReportServer.config file:

<Data>
 <Extension Name="SQL"
 <Extension Name="SQLAZURE"
 <Extension Name="SQLPDW"
 <Extension Name="OLEDB"
 <Extension Name="OLEDB-MD"
 <Extension Name="ORACLE"
 <Extension Name="ODBC"
 <Extension Name="XML"
 <Extension Name="SHAREPOINTLIST"
 <Extension Name="SAPBW"
 <Extension Name="ESSBASE"
 <Extension Name="TERADATA"
</Data>

The following is an abbreviated list of what present in the RSReporDesigner.config file:

<Data>
  <Extension Name="SQL"
  <Extension Name="SQLAZURE"
  <Extension Name="SQLPDW"
  <Extension Name="OLEDB"
  <Extension Name="OLEDB-MD"
  <Extension Name="ORACLE"
  <Extension Name="ODBC"
  <Extension Name="XML"
  <Extension Name="RS"
  <Extension Name="SHAREPOINTLIST"
  <Extension Name="SAPBW"
  <Extension Name="ESSBASE"
  <Extension Name="TERADATA"
</Data>

I'm running SQL Server 2008 R2

ProductVersion       ProductLevel       Edition
10.50.1600.1          RTM                   Enterprise Edition (64-bit)

The operating system is Windows 7 Professional 64 bit.

Thank you for your help!

cdun2