Excel 2000 COM object

[Dent]

I am having a problem with a program that I wrote to format an Excel
spreadsheet. I wrote the program on a WinXP/Office XP/Visual Studio .NET
2003 computer. I am using late-binding. When I try to run the program on a
Win2000/Office 2000 computer, it errs out during runtime. The error shows
that the parameters are incorrect for the Open statement. The problem that
I am having is that many of the Excel 2000 methods seem to take parameters
differently than Excel 2002 methods, even at the most basic level. For
example, this Open statement is what I use when compiling for Excel 2002:

internal object Open( object objBooks, string fileName )
{
object[] Parameters;
Parameters = new Object[15];
Parameters[0] = fileName;
Parameters[1] = Type.Missing;
Parameters[2] = Type.Missing;
Parameters[3] = Type.Missing;
Parameters[4] = Type.Missing;
Parameters[5] = Type.Missing;
Parameters[6] = Type.Missing;
Parameters[7] = Type.Missing;
Parameters[8] = Type.Missing;
Parameters[9] = Type.Missing;
Parameters[10] = Type.Missing;
Parameters[11] = Type.Missing;
Parameters[12] = Type.Missing;
Parameters[13] = Type.Missing;
Parameters[14] = Type.Missing;
return objBooks.GetType().InvokeMember( "Open",
BindingFlags.InvokeMethod, null, objBooks, Parameters );
}

And, after experimentation, here is what I had to use to make it work with
Excel 2000:

internal object Open( object objBooks, string fileName )
{
object[] Parameters;
Parameters = new Object[1];
Parameters[0] = fileName;
return objBooks.GetType().InvokeMember( "Open",
BindingFlags.InvokeMethod, null, objBooks, Parameters );
}

I am also having problems with the Range.Sort method and the Workbook.Close
method. All of these methods run just fine on the Office XP computer, but
they give me "Incorrect number of parameters" errors on the Office 2000
computer.

Has anyone had any experience passing parameters to the Excel COM object. Do
I need to use a different technique?

Thanks,
Dennis