Manifest or Config for DLL

I am trying to relax the version of a dll referenced by another dll

All the below assemblies are signed
Exe
   ABC.DLL v1.0.0
        XYZ.DLL v1.0.0

I want to allow ABC.DLL'S reference to XYZ to be relaxed to allow 2.0.0 using a config file.  I was hoping to beable to have an ABC.DLL.Config file with the below XML to relax the dependency.  This doesn't get loaded.  I know if I include the same XML in the Exe.exe.config it will work but I don't want to modify that config file.  I just want to distribute something with the dll that is self sufficient.

Any Suggestions?

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  <runtime>
    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
      <dependentAssembly>
        <assemblyIdentity name="XYZ"
           publicKeyToken="07120f88a15020d6" />
        <bindingRedirect oldVersion="1.0.0.0"
                         newVersion="2.0.0.0"/>
      </dependentAssembly>
    </assemblyBinding>
  </runtime>