Bump.
Would be great if maybe someone of the staff could answer to this as Graham was so kind to answer back in 2017. But what he suggested was not the solution as it seems.
We both, Ariel and I, have a fresh P3D install. No other APX files for that airport, except the P3D default one as Ariel already described above. Have even renamed this file to .bgx, but AI still lands on the grass runway nevertheless.
With a tool called "airport creator" I have opened the Orbx LOWI APX file and realized that even Westwinds APX files contain 3 runways for LOWI.
For me its not a minor flaw. Realistic AI Traffic is the icing on the cake of every superb airport add-on. Without AI Traffic its lifeless and lacks immersion.
If there is an easy solution that I don't see yet, let me know. I am very new to P3D. Have used FS9 for 15 yrs. Although many things are similar to FS9, its very different in some parts.
Thanks
Al