Вместо х вставьте порядковый номер текстуры.

[fltsim.x]
title=PMDG 737-800NGX Azimuth Airlines
sim=B737-800WL
model=
panel=
sound=
texture=A4
kb_checklists=Boeing737-800_check
kb_reference=Boeing737-800_ref
atc_airline=Azimuth
atc_id=VP-BGH
atc_flight_number=123
atc_model=737-800
atc_parking_types=GATE,RAMP
atc_type=BOEING
ui_createdby=PMDG
ui_manufacturer=Boeing
ui_type=737-800NGX
ui_typerole=737-800
ui_variation=Azimuth Airlines
airline_name=Azimuth
description=Boeing 737-800 powered by CFM engines v 1.0\nPMDG Simulations\nwww.precisionmanuals.com \n\nProduced under license from Boeing Management Company.\n\nBoeing 737, 737-800 & Boeing are among the trademarks owned by Boeing.
visual_damage=0