mebull

For the default airport, the file that Peter linked to is the best there is. The parking is a bit outdated now but can easily be updated with AFCAD. I have taken this file (the airport) and opened it with Airport Design Editor and used that to import Jim Viles' scenery file(s) and his approach file as well as adding the military facilities. I also updated the cross wind runway set up with a more modern method provided right in ADE. All in all, what Jim packaged and uploaded as it stands is still a vast improvement of the stock airport and approaches.
 
If you are using a freeware add on airport or a payware airport you may have to resort to learning ADE and how to write the approach yourself with the caveat that if the appropriate runway(s) have not been moved by the scenery creators the approach file created by Jim should still work, placed according to his original instructions ( just don't use any of his other files!).
 
To answer you question as asked, "How to change Approaches?", the most straight forward answer would be; With Airport Design Editor (assuming a stock airport or a simple modified AFCAD airport), open the stock airport with ADE. It will automatically import every thing related to the airport including the approaches. From there you would need to go to the Approach Mode section, find the approach you wish to change and manually edit the data. Save the project and compile the airport. I've done it quite a few times as well as create entirely new approaches. I hopes this helps you out and gives you the answer you needed.
 
Regards,

Here is an example for you to work from. This is from a PA Airbus 320 version 2.1 aircraft.cfg file [lights] section.
 
[lights]
light.0=4,  44.41,  0.00,  3.50, fx_vclighth
light.1=5,  25.31,  6.8,  1.70, B738wing
light.2=5,  25.31,  -6.8,  1.70, B738wing
light.3=8, -22.50, 19, 0, AS_Rainwash.fx
light.4=8, -22.50, -19, 0, AS_Rainwash.fx
light.5=10, 35.84, 0.0, -11.9619, Gear_Rainwash.fx
light.6=9,  -6.660, -12.458, -12.22, Gear_Rainwash.fx
light.7=9,  -6.660,  12.458, -12.22, Gear_Rainwash.fx
 
light.1 and light.2 are the ones you would be interested in. But, . . . . . basically you already have that. so the only thing you need to do is make sure you have the two effects that are used. and add the lines you posted as an example;
 
light.1=8,   25.31,  6.67,  1.70, fx_navwhih
light.2=8,  25.31,  -6.67,  1.70, fx_navwhih
light.3=8,  25.31,  6.8,  1.70, B738wing
light.4=8,  25.31,  -6.8,  1.70, B738wing
 
To your [lights] section. Making sure to renumber renumber them correctly. The light(period) numbers have to begin with zero and continue in numerical order and no greater than light.18=. The order of the effects in not important. So in the example I gave you above if I wish to add the effect that is missing (as per your example ) it might look something like this.
 
[lights]
light.0=4,  44.41,  0.00,  3.50, fx_vclighth
light.1=5,  25.31,  6.8,  1.70, B738wing
light.2=5,  25.31,  -6.8,  1.70, B738wing
light.3=8, -22.50, 19, 0, AS_Rainwash.fx
light.4=8, -22.50, -19, 0, AS_Rainwash.fx
light.5=10, 35.84, 0.0, -11.9619, Gear_Rainwash.fx
light.6=9,  -6.660, -12.458, -12.22, Gear_Rainwash.fx
light.7=9,  -6.660,  12.458, -12.22, Gear_Rainwash.fx
light.8=8,   25.31,  6.67,  1.70, fx_navwhih
light.9=8,  25.31,  -6.67,  1.70, fx_navwhih
 
notice light.8 and light.9 added at the end or I could have done it like this;
 
[lights]
light.0=4,  44.41,  0.00,  3.50, fx_vclighth
light.1=8,   25.31,  6.67,  1.70, fx_navwhih
light.2=8,  25.31,  -6.67,  1.70, fx_navwhih
light.3=8,  25.31,  6.8,  1.70, B738wing
light.4=8,  25.31,  -6.8,  1.70, B738wing
light.5=8, -22.50, 19, 0, AS_Rainwash.fx
light.6=8, -22.50, -19, 0, AS_Rainwash.fx
light.7=10, 35.84, 0.0, -11.9619, Gear_Rainwash.fx
light.8=9,  -6.660, -12.458, -12.22, Gear_Rainwash.fx
light.9=9,  -6.660,  12.458, -12.22, Gear_Rainwash.fx
 
 
I hope this helps you out.
 
Regards,