Hello here is a copy of my 737-400 cfg file and each of these is a texture.maybe this will help you get the idea of what you need.

[fltsim.0]
title=Boeing 737-400
sim=Boeing737-400
model=
panel=
sound=
texture=
kb_checklists=Boeing737-400_check
kb_reference=Boeing737-400_ref
atc_id=N737Z
atc_airline=CITRUS
atc_flight_number=1123
ui_manufacturer=Boeing
ui_type="737-400"
ui_variation="Airtran Airlines"
description="One should hardly be surprised that the world's most prolific manufacturer of commercial aircraft is also the producer of the world's most popular jetliner. The 737 became the best-selling commercial jetliner worldwide when orders for it hit 1,831 in June 1987 (surpassing Boeing's own 727 as the previous champ). However, it wasn't always that way\s in the first few years of production, there were so few orders that Boeing considered canceling the program. They didn't, and the airplane has more than proven itself in over three decades of service."

[fltsim.1]
title=Boeing 737-400 Paint1
sim=Boeing737-400
model=
panel=
sound=
texture=1
kb_checklists=Boeing737-400_check
kb_reference=Boeing737-400_ref
atc_id=N737W
atc_airline=NORTHWEST
atc_flight_number=1123
ui_manufacturer=Boeing
ui_type="737-400"
ui_variation="Northwest Airlines"
description="One should hardly be surprised that the world's most prolific manufacturer of commercial aircraft is also the producer of the world's most popular jetliner. The 737 became the best-selling commercial jetliner worldwide when orders for it hit 1,831 in June 1987 (surpassing Boeing's own 727 as the previous champ). However, it wasn't always that way\s in the first few years of production, there were so few orders that Boeing considered canceling the program. They didn't, and the airplane has more than proven itself in over three decades of service."

[fltsim.2]
title=Boeing 737-400 Paint2
sim=Boeing737-400
model=
panel=
sound=
texture=2
kb_checklists=Boeing737-400_check
kb_reference=Boeing737-400_ref
atc_id=N737X
atc_airline=US AIR
atc_flight_number=1223
ui_manufacturer=Boeing
ui_type="737-400"
ui_variation="US AirWAYS"
description="One should hardly be surprised that the world's most prolific manufacturer of commercial aircraft is also the producer of the world's most popular jetliner. The 737 became the best-selling commercial jetliner worldwide when orders for it hit 1,831 in June 1987 (surpassing Boeing's own 727 as the previous champ). However, it wasn't always that way\s in the first few years of production, there were so few orders that Boeing considered canceling the program. They didn't, and the airplane has more than proven itself in over three decades of service."

[fltsim.3]
title=Boeing 737-400 Paint3
sim=Boeing737-400
model=
panel=
sound=
texture=3
kb_checklists=Boeing737-400_check
kb_reference=Boeing737-400_ref
atc_id=N737Y
atc_airline=SOUTHWEST
atc_flight_number=1123
ui_manufacturer=Boeing
ui_type="737-400"
ui_variation="Southwest Airlines"
description="One should hardly be surprised that the world's most prolific manufacturer of commercial aircraft is also the producer of the world's most popular jetliner. The 737 became the best-selling commercial jetliner worldwide when orders for it hit 1,831 in June 1987 (surpassing Boeing's own 727 as the previous champ). However, it wasn't always that way\s in the first few years of production, there were so few orders that Boeing considered canceling the program. They didn't, and the airplane has more than proven itself in over three decades of service."

[fltsim.4]
title=Boeing 737-400 Paint4
sim=Boeing737-400
model=
panel=
sound=
texture=4
kb_checklists=Boeing737-400_check
kb_reference=Boeing737-400_ref
atc_id=N737T
atc_airline=DELTA
atc_flight_number=1123
ui_manufacturer=Boeing
ui_type="737-400"
ui_variation="Delta Airlines"
description="One should hardly be surprised that the world's most prolific manufacturer of commercial aircraft is also the producer of the world's most popular jetliner. The 737 became the best-selling commercial jetliner worldwide when orders for it hit 1,831 in June 1987 (surpassing Boeing's own 727 as the previous champ). However, it wasn't always that way\s in the first few years of production, there were so few orders that Boeing considered canceling the program. They didn't, and the airplane has more than proven itself in over three decades of service."