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I find the path of Microsoft.Office>interop.Excel under the Solution/References is
C:\WINDOWS\assembly\GAC\Microsoft.Office.Interop.Excel\11.0.0.0__71e9bce111e9429c\Microsoft.Office.Interop.Excel.dll
However, such a file doesn't exist on my C:\WINDOWS\assembly\GAC at all. Further, there is not GAC folder under C:\WINDOWS\assembly.
Any idea?