Copy below everything into your aircraft.cfg file in boeing 737-800 folder.
Replace the "X" to the next value in the cfg file.
Happy Flying!

[fltsim.X]
title=Boeing 737-800 pia Thatta
sim=Boeing737-800
model=
panel=
sound=
texture=Thatta
kb_checklists=Boeing737-800_check
kb_reference=Boeing737-800_ref
atc_id=
atc_airline=PIA
atc_flight_number=
ui_manufacturer="Boeing"
ui_type="737-800"
ui_variation="Thatta"
ui_typerole="Commercial Airliner"
ui_createdby="Rashad Waseem"
description="PIA Thatta Treasures of the Past Livery painted by Rashad Waseem on behalf of PIA-Virtual! Http://www.pakistanvirtual.com"


No techical support is available as the livery has been tested on few machines and it works!

Rashad at Rashad546@hotmail.com
Http://www.pakistanvirtual.com
Youtube: piaforever1
Join us on Facebook: Rashad Waz

This livery internal cockpit has been been given repaited look with exterior
and interior professional finish!
Winglets, engines and body are painted in reflective textures! It will shine in the sun!
These textures have no mud no greese no grime! Fly it brand new like freshly painted
in the repaint Factory ready to fly!