Excel 2003 (11.803.8036) SP2
 
Can anyone please tell me why my worksheet opens as "Read-Only" when I issue 
the following statement(s):

Object oMissing = System.Reflection.Missing.Value;

oBook = oExcel.Workbooks.Open(openFileDialog1.FileName,
                    oMissing, false, oMissing, oMissing, oMissing, oMissing, oMissing, oMissing, oMissing, oMissing, oMissing, oMissing, oMissing, oMissing);