Please help with the encoding issue for SSRS rendering in CSV

My system environment: win2008 R2 SP1 64bit + SQL 2005 SP4 32bit

I amended the configuration file of rsreportserver.config with the below:

  <Extension Name="CSV" Type="Microsoft.ReportingServices.Rendering.CsvRenderer.CsvReport,Microsoft.ReportingServices.CsvRendering" >
  <Configuration>
  <DeviceInfo>
   <Encoding>UTF-8</Encoding>
  </DeviceInfo>
  </Configuration>
   </Extension>

If I run the report and then click export by selecting the csv format, it looks ok with the encoding of UTF-8.

However, the same report , when I created a subscription and saved it in the hard driver. Its encoding became USC-2 Little Endian.

Any assistance is much appreciated.