I create a windows service. In its start method I try to open an excel file. I use the following code: Excel.Application excelApplication = new Excel.ApplicationClass(); object _missingParam = Missing.Value; Excel.Workbook _excelWorkbook = excelApplication.Workbooks.Open(filename,0, 0, _missingParam, _missingParam, _missingParam, _missingParam, _missingParam, _missingParam, _missingParam, _missingParam, _missingParam, _missingParam); On windows XP when I start the service this works fine. But on windows Vista I get the following error: System.Runtime.InteropServices.COMException (0x800A03EC): Exception from HRESULT: 0x800A03EC.
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