Ok just reread your post.
It crashes.
Hmmmn, if I understand you correctly; you were then able to load the mission by putting another .ogg file, by just renaming it to fire.ogg?
I'd still like an email with your files; zip or rar them up if possible.
Everything else in the description.ext looks ok, except:
May not matter in this case.
I also noticed your db set to 0-- try 20 or up to 45.
sound[] = {\music\fire.ogg, db+0, 1.0};