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$FG_HOME is an environment variable representing the path to where user-specific data is stored (not application data). Basically, it is a name for a directory that varies with the operating system and stores information between sessions: configuration/preferences, properties marked with the "user-archive" attribute, and aircraft-specific settings (using the data helper class in aircraft.nas).
Common paths
- Windows: %APPDATA%\flightgear.org\
- %APPDATA% is another environment variable that depends on your Windows version. On XP and older, it can be found under C:\Documents and Settings\{username}\Application Data. On Vista and later it can be found under C:\Users\{username}\AppData. The folder is hidden by default; see these instructions to unhide the folder.
- Mac OS X: ~/Library/Application Support/FlightGear (to learn more about viewing hidden folders, see [1])
As all future FG updates (Scenery/TerraSync & Aircraft plus your FG preferences) will be directed to these hidden folders, it is a good idea to have their access available easily.
Desktop/Finder/Go/Go to Folder is where you need to start.
When given the option, input: ~/Library/Application Support/FlightGear
It is probably a good idea to have '~/Library/Application Support/FlightGear' saved on a Stickies note just in case you forget it.
If you want/need to refer to any of these files frequently, you could make an alias of a file, or the whole folder, and place it somewhere easier to access.
- Linux: ~/.fgfs/
- Windows: %APPDATA%\flightgear.org\
- Mac OS X: ~/Library/Application Support/FlightGear
- Linux: ~/.fgfs/