Force Excel 2002 (Office XP) to support .NET v2.0.50727

Copy Excel.Exe.Config side by side with Excel.exe

<?xml version="1.0"?>
<configuration>
  <startup>
   <supportedRuntime version="v2.0.50727"/>
  </startup>
</configuration>

By default it is under

C:\Program Files\Microsoft Office\Office10\