Different Interop references on two different computers doesn't work

Question

When I add a reference to Microsoft.Office.Interop.Excel on my computer, Visual Studio adds this to the project file:

Answer 1

I found the cleanest way to use it, this also allows for multiple versions of the interop, is to create a shared bin\Office Interop\11 or 12\Microsoft.Office.Interop.Excel.dll\ and refeferenced them from the project, works a treat for different version