Hi Luca,

The following works fine for me.

Copy the "texture.ALITALIA" folder into the CS_B777-200LR directory, and remove all files except the following:
cs777_1_T
cs777_2_T
cs777_3_T
cs777_6_T
cs777_7_T
cs777_9_T
thumbnail.jpg
texture.cfg

The texture.cfg files should have these lines in it:
[fltsim]
fallback.1=..\texture
fallback.2=..\..\CS_B777-200ER_GE\texture
fallback.3=..\..\CS_B777-200ER_GE\texture\night
fallback.4=..\..\CS_B777-200ER_GE\texture\spec
fallback.5=..\..\CS_B777-200ER_GE\texture\bump

Place the following entry in the aircraft.cfg file which is in the CS_B777-200LR folder, where the X in "[fltsim.X]" is the next sequential number (3 would be OK if you haven't already added liveries to the CS_B777-200LR model):
[fltsim.X]                
title=CS 777-200 Alitalia
sim=csx772_LR
model=200LR_GE
panel=
sound=
texture=ALITALIA      
kb_checklists=
kb_reference=
atc_id=I-DISU
atc_airline=ALITALIA
atc_flight_number=A777
atc_heavy=1
ui_manufacturer=Boeing
ui_type="777-200LR GE"
ui_variation=ALITALIA
ui_typerole="Commercial Airliner"
ui_createdby="Captain Sim"
description="777-200ER I-DISU REPAINT BY MARCELO F. VENEZIALE  Exterior Model\n777 Captain 0.1\n(c) 2011 Captain Sim www.captainsim.com"

Good luck!
Fabio