These three files go in your CFSWW1 Over Flanders Fields/effects/fxtextures folder.
They recreate the British 0.303 SPG Mark VIIG tracer round that became available in late 1916, and was produced through 1938. It used a payload of 8 parts Barium Chloride and 1 part Magnesium to produce a bright greenish white trace.
The most common example of these rounds had a headstamp of KN for Kings Norton Metal Co., Birmingham, UK. This company was formed in 1890 at Kings Norton, it owned its own rolling mills and had a loading plant at Abbey wood in Kent. Cases were made in Birmingham then assembled and loaded at the Abbey Wood Factory, next to Woolwich Arsenal.
Wings Over Europe key command profile for the Logitech Wingman Joystick Software.