Help..I knew this day would come ...I D/L amd put in an add on scenery file <Gibraltar, UK V.2 **********
              Version 2
         For FS2002 only.
          By Michael Magner>
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I followed the instructions......Unzip files into a temporary folde Just place the "gib" file into your main FS scenery folder. The scenery should automatically add itself under Europe, United Kingdom, Gibraltar in the airport directory.
The scenery is there and working ok...but when i start FS up i get this message on screen....(Scenery.cfg error invalid remote scenery path in scenery area 121..which you know is Additional facility Data.....I click ok and the sim continues ok as far as i see.....Can you please help me on this and point me in the right direction to sort this out  as i dont want to reinstall the FS again if there is a way out of this  Thanks All   8)

Ok Hagar thanks for the advice..i checked ur tutorial and it looks good, so in future i will follow it from now on.....just one question how do i get rid of the error message im getting....do i go back to the original zip file and then look for each BGL file that it has and then look for them in FS scenery and delete them as i find them, then use your method or would it be quicker to reinstall FS thiis time and be more carefull in future 

Ok Hagar i did remove the bgl files and every thing from Gibraltar  but the error was still there so uninstalled FS and reinstalled and added Gibraltar scenery and is running ok now...drastic i know but no problem  as i use this pc to try out add ons if ok i then add them to other pc which is faster than this one (sort of test bed pc)  8)