From SQL To Excel 12 Via A DataSet - Exports In Binary (xlsb)

Hi,
I am experimenting with taking a dataset from SQL and putting it directly into an excel via a DataSet. It works but the exported Excel is in "binary" format. Does anyone know of a way to get it directly into xlsx? I *may* end up doing it in a foreach anyway, but it would be too cool to be able to just transfer my dataset from one connection to another :-).
Thanks, here's my code:

DataSet dsXLData = new DataSet("XL");

string myQuery = "SELECT table1.Email,table2.FirstName FROM Contacts table1, Users table2 where table2.UserID = table1._UserID";

SqlConnection sqlcon = new SqlConnection(DataAcquire.ConnectionString);

SqlCommand comStatus = new SqlCommand(myQuery, sqlcon);
SqlDataAdapter dasql = new SqlDataAdapter();

DataSet ds = new DataSet();

dasql.AcceptChangesDuringFill = false;

dasql.SelectCommand = comStatus;
dasql.Fill(ds, "Export");

string connectionString = @"Provider=Microsoft Office 12.0 Access Database Engine OLE DB Provider;
Data Source=D:xlsBook6.xlsb;Extended Properties=
""Excel 12.0;HDR=YES;""";

OleDbConnection maconn = new OleDbConnection(connectionString);
maconn.Open();

OleDbDataAdapter da = new OleDbDataAdapter();

OleDbCommand comOleDBCommand = new OleDbCommand("CREATE TABLE [Export] (Email char(255), FirstName char(255));", maconn);
comOleDBCommand.ExecuteNonQuery();

OleDbCommand comExport = new OleDbCommand(
"INSERT INTO Export (Email, FirstName) VALUES (@Email, @FirstName)", maconn);


comExport.Parameters.Add("@Email", OleDbType.Char, 255, "Email");
comExport.Parameters.Add("@FirstName", OleDbType.Char, 255, "FirstName");
comExport.UpdatedRowSource = UpdateRowSource.None;

da.InsertCommand = comExport;
da.Update(ds, "Export");
da.Dispose();
comExport.Dispose();
maconn.Dispose();

dasql.Dispose();

sqlcon.Dispose();