Where in FSX can you find the file that list all countries on the "Current Locations" screen.I have duplicate countries (ie, United States - United Kingdom -etc.)? Want to delete them or at least correct the spelling.

These are read out of airport files, either the default APX files or in add on files. You'd have to identify the offending file(s), decompile them to XML, edit the entries and then recompile. Not an easy task. I don't anticipate any of the APX (default) files would need to be corrected. If there was that possibility, it would entail a whole lot more effort to be done properly.

Thank you for the fast response. Sounds like more trouble than its worth...

You can run Pete Dowson's MakeRwys utilty (under Useful Additional Files) and it will output several files... the runways.txt and the runways.xml files (they're both pretty big) will contain this data.Examples...

<ICAO id="00AL"><ICAOName>Epps Airpark</ICAOName><Country>United States</Country><State>Alabama</State><City>Harvest</City><Longitude>-86.770279</Longitude><Latitude>34.864811</Latitude><Altitude>820</Altitude><MagVar>0.000</MagVar><Runway id="01"><Len>2300</Len><Hdg>10.000</Hdg><Def>Grass</Def><ILSFreq></ILSFreq><ILSHdg></ILSHdg><Lat>34.861698</Lat><Lon>-86.770950</Lon></Runway><Runway id="19"><Len>2300</Len><Hdg>190.000</Hdg><Def>Grass</Def><ILSFreq></ILSFreq><ILSHdg></ILSHdg><Lat>34.867908</Lat><Lon>-86.769608</Lon></Runway></ICAO>

Airport 00AL :N34:51:53.2932  W086:46:12.9985  820ft		  Country Name="United States"		  State Name="Alabama"		  City Name="Harvest"		  Airport Name="Epps Airpark"		  in file: Scenery\0302\scenery\APX24190.bgl		  Runway 1 /19  centre: N34:51:53.2932  W086:46:12.9985  820ft			  Start 1 : N34:51:42.4734  W086:46:15.3193  820ft Hdg: 10.0T, Length 2300ft			  Computed start 1 : Lat 34.861698 Long -86.770947			  Start 19 : N34:52:04.1129  W086:46:10.6778  820ft Hdg: 190.0T, Length 2300ft			  Computed start 19 : Lat 34.867908 Long -86.769611			  Hdg: 10.000 true (MagVar 0.000), Grass, 2300 x 200 ft			  *** Runway *** 00AL0010 Lat 34.861698 Long -86.770950 Alt 820 Hdg 10 Len 2300 Wid 200			  *** Runway *** 00AL0190 Lat 34.867908 Long -86.769608 Alt 820 Hdg 190 Len 2300 Wid 200		  FSM A/P 00AL, lat=34.864811, long=-86.770279, alt=820

Thank you for the fast response. Sounds like more trouble than its worth...

Depending upon how many there are, it's possible to make an XML template and use that to fill in the data for the airport. All the runway, apron, taxiway info is not needed, just primarily name, lat/lon, etc. Compile the file and make sure it get's read before the default APX files and the corrected location data will stick inside FSX.SDKs would be required.