Неможу отримати додаткові данні з документа.
[STAThread]
static void Main ( string[] args )
{
Excel.Application xl = new Excel.Application();
OpenFileDialog OFD = new OpenFileDialog();
OFD.ShowDialog();
xl.Workbooks.Open(OFD.FileName, Type.Missing, true, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing);
Microsoft.Office.Core.DocumentProperties CP = xl.Workbooks[1].CustomDocumentProperties as Microsoft.Office.Core.DocumentProperties;
MessageBox.Show(CP[1].Name); //Видає помилку Object reference not set to an instance of an object.
xl.Quit();
}