Código Delphi [-]
uses ComObj;

procedure TForm1.Button1Click(Sender: TObject);
var Word: OleVariant;
begin
 Word := CreateOleObject('Word.Application');
 Word.Documents.Add('c:\doc1.rtf');
 Word.ActiveDocument.Select;
 Word.Selection.Copy;
 Word.Documents.Add('c:\doc2.rtf');
 Word.Selection.Paste;
 Word.ActiveDocument.SaveAs('c:\documento.doc');
 Word.Quit;
end;