OLE2 from forms 5.0 What's going wrong ?

I would like to open a word document using the built-in OLE2 package of forms like this

DECLARE
  application OLE2.obj_type ;
  args OLE2.list_type ;
BEGIN
  application := OLE2.create_obj('Word.Basic') ;   OLE2.invoke(application, 'AppShow') ;

  args := OLE2.create_arglist ;

  OLE2.add_arg(args, 'C:\my_dev\example.doc') ;
  OLE2.invoke(application, 'FileOpen', args) ;
  OLE2.destroy_arglist(args) ;

  OLE2.release_obj(aplication);
END ; But nothing happens. What should I do either in my forms or in the Word document in order to be able to open my file ?

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