Where in the main FS 2004 folder in the FS2004(FS9) configuration.
C/Program Files/Microsoft Games/FS9
what i mean is where is like a folder or something to look into. the project opensky A330 requires you to edit a part of the FS9 configuration to declare the FSSound module as old to let the guages work. so where can i edit the main folder
The main FS9 folder you want is where FEM said.
Look in the main aircraft folder for your A330, everything will be in that.
You can alter the CFG then.