How can I use a config-file in Expression Blend 4?

Question

Hi, while trying to use the "InfoStrat"-Bing-Maps-Control in Expression Blend 4 for my Surface Application, I get the error message: "Mixed mode assembly is built against version v2.0.50527 of the runtime and cannot be loaded in the 4.0 runtime without additional configuration information"

I already found out that I need to write this configfile:

<configuration>
   <startup useLegacyV2RuntimeActivationPolicy="true">
    <supportedRuntime version="v4.0"/>
   </startup>
</configuration>

But Expression Blend doesn't seem to recognize that it is there. So how can I solve this problem?