I think you mean the first file here.
http://simviation.com/1/search?submit=1&keywords=737+wachanko&categoryId=There's a mistake in the new Aircraft.cfg entry. The texture= line must match the name of the new Texture folder which is
texture.WACHANKO2Change it to this & it should work.
[fltsim.6]
title=Boeing 737-800 WACHANKO
sim=Boeing737-800
model=
panel=
sound=
texture=
WACHANKO2kb_checklists=Boeing737-800_check
kb_reference=Boeing737-800_ref
atc_id=PR-GTH
atc_airline=WACHANKO
atc_flight_number=W123
ui_manufacturer="Boeing"
ui_type="737-800"
ui_variation="WACHANKO"
ui_typerole="Commercial Airliner"
ui_createdby="Microsoft Corporation"
description="Creation by Walter Sanchez para el grupo de Vuelos Del Kora."