ms office version problem Opening, creating and editing ms word file

Question

hi all,
i m working in desktop application in C#, in which i m using ms word for reports generating. i m getting problem with ms word version means  ms office 97, 2000, 2002, 2003, 2007 all behaving with different. as method
WordApp.Documents.Open()
required different no of argument parameter for different version,
how can we use this application usable for all version of ms office without any problem
pls help me thanks