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First of all IF10 gets the Ai Aircraft List from the fsx.cfg [Main] section
"C:\Users\<you>\AppData\Roaming\Microsoft\FSX\fsx.cfg"

[Main]
..
..
SimObjectPaths.7=MyAiTrafficProgram\Aircraft
SimObjectPaths.8=D:\ExtraAiAircraft
..

To restart the Ai Aircraft Listing in IF10, delete the file:
"C:\ProgramData\Ideal Flight 10\Profiles\AIInclude.dat"

Then start IF and go to the Flight Gen page - Mission page - Ai Selection window to see they are included.

Include aircraft by placing a tick in the checkbox against the aircraft desired.
Repeat use of the \Airplanes and \Other buttons set and unset aircraft categories.



Note:

The [AircraftIncludeDirs] section of IF10 Settings.ini is ONLY FOR USER AIRCRAFT
"C:\ProgramData\Ideal Flight 10\Profiles\Settings.ini"

[AircraftIncludeDirs]
Dir1=SimObjects\Airplanes
Dir2=SimObjects\Rotorcraft
Dir3=D:\ExtraAiAircraft - wrong - do not include