WebBrowser ExecWB failed

[John]

Office Professional 2003

I have a WebBrowser control called ctlWebBrowser in a Word form.
It gives a runtime error of Method ExecWB of object failed.

Private Sub btnTransfer_Click()
Call ctlWebBrowser.ExecWB(OLECMDID_OPEN, OLECMDEXECOPT_PROMPTUSER)
End Sub

It also doesn't like
Call ctlWebBrowser.ExecWB(cmdID:=OLECMDID_SELECTALL,
cmdexecopt:=OLECMDEXECOPT_DONTPROMPTUSER)

Is there something I need to setup to make the ExecWB work? Thanks