Scripts are not working.

Another question about the sounds: I recorded a script for a sound, but the problem is that the game console complains that the sound file was not found. I moved the sound file to the music folder and, just in case, also to the map archive. Here is the script:
function StartF()
MessageBox ("/Maps/SingleMissions/LotR_1/Nazgul_begin.txt");
Play2DSound ("Scream.ogg")
end;

Trigger(REGION_ENTER_AND_STOP_TRIGGER, "StartLocation", "StartF");