Get all opened Excel-documents

Question

I need create xls-file with own data. But file may already be created, and opened by user.

(1) If file not exist: new ApplicationClass() Workbooks.Add() SaveAs()...

Answer 1

I know is late to answer you, but may be useful to someone else.

Microsoft.Office.Interop.Excel.Application oExcelApp;

oExcelApp = System.Runtime.InteropServices.Marshal.GetActiveObject("Excel.Application");

foreach (Microsoft.Office.Interop.Excel.Workbook WB in oExcelApp.Workbooks) {
   MessageBox.Show(WB.FullName);
}

oExcelApp = null;