Method of IApplication
Navigates to position in document, opening it if necessary
var ppDocument = Application.Navigate(strPathName, nLine, nPos, bActivate);
ppDocument = Application.Navigate strPathName, nLine, nPos, bActivate
CComPtr<ITextDocument> pDocument; HRESULT hr = Application.Navigate(strPathName, nLine, nPos, bActivate, &pDocument);