Hi tesza.

I believe I have found the reason for the problem with why you don't see the winglets.

This is what is provided in the README_W.txt:-

[fltsim.x]
title=CS 767-300 Captain Air New Zealand Winglets
sim=B767-300GE
model=ge5
panel=
sound=GE
texture=anz_W
kb_checklists=
kb_reference=
atc_id=N764A
atc_airline=new zealand
atc_flight_number=767
atc_heavy=1
atc_parking_types=
ui_manufacturer="Boeing"
ui_typerole="Commercial Airliner"
ui_createdby="Captain Sim"
ui_type="767-300 GE"
ui_variation="Air New Zealand Winglets"
description="767-300 Base Pack v1.0\n(c) 2009 Captain Sim www.captainsim.com\n Repaint: Carl Hudson/Teraphic (c) 2009."
ui_wglts=WL

This it what it should be :-

[fltsim.x]
title=CS 767-300 Captain Air New Zealand Winglets
sim=B767-300GE
model=ge5
panel=
sound=GE
texture=anz_W
kb_checklists=
kb_reference=
atc_id=N764A
atc_airline=new zealand
atc_flight_number=767
atc_heavy=1
atc_parking_types=
ui_manufacturer="Boeing"
ui_typerole="Commercial Airliner"
ui_createdby="Captain Sim"
ui_type="767-300 GE"
ui_variation="Air New Zealand Winglets"
description="767-300 Base Pack v1.0\n(c) 2009 Captain Sim www.captainsim.com\n Repaint: Carl Hudson/Teraphic (c) 2009."
ui_wglts=1

Hope this helps.

Mark