Since Office 2007 is outdated and no longer supported by Microsoft, consider using:
In Visual Studio, go to and search for Microsoft.Office.Interop.Excel . This allows you to code against Excel interfaces without needing the specific "12.0" COM DLL installed on your development machine (though you still need Excel installed on the machine running the code). microsoft excel 12.0 object library download
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Here is how to obtain it and how to add it to your project. Since Office 2007 is outdated and no longer