Copy texture.rdknght to your Extra 300S folder
Add the following to the aircraft.cfg file:

[fltsim.xx]
title=Extra 300S Red Knight
sim=Extra300S
model=
panel=
sound=
texture=rdknght
kb_checklists=Extra300S_check
kb_reference=Extra300S_ref
atc_id_color=0xffff0000
atc_id=n346gn
ui_manufacturer="Extra"
ui_type="300S"
ui_variation="EXTRA 300s"
ui_typerole="Single Engine Prop"
ui_createdby="Microsoft Corporation"
description="If airplanes were horses, the Extra 300S would be a champion thoroughbred. It is, in fact, designed to be a champion in Unlimited class aerobatic competitions. The 300S combines light weight, a 300-horsepower engine, and exquisite control harmony in an aircraft that has won several World Aerobatic Championships. The Extra 300S is the aircraft of choice for Patty Wagstaff, one of the world's top award-winning aerobatic pilots."

replace "xx" with the next valid number.

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