Hi Pete & Thomas,
Problem has been sorted as follows:
I looked at your instructions again and decided to test FS2004. I copied the MakeRwys.exe file into the main folder showing the scenery.cfg (as instructed ), ran it and it worked.
I went back and checked my fsx-se previous extraction and found the extraction process had made a folder MakeRwys in the FSX folder and extracted the MakeRwys.exe file to there incorrectly. As it cannot find a scenery.cfg file there it could not do its job. I copied MakeRwys.exe and created it in the FSX folder, ran it and it recognised the airports. I then deleted the MakeRwys folder created by the extraction process.
I thank you for your assistance in this matter...
I will now test if it works inside the game and update you with my findings.
Regards
Buzz887