I found the way myself. This is the code that works:

private: System::Void button7_Click(System::Object^ sender, System::EventArgs^ e)
{
String^ XlsFile =...

Hy, I have to develop an application usign Visual C++ 2008 that should handle (open, change cells and save) some Excel 2003 sheets. I am using .NET Framework 3.5 and the COM reference...