They shouldn't have to rename anything if you zip up victoryl.wav. Don't put it in LevelFiles or any .lvz as it will increase download time. Just unzip to zone folder.
Any gfx/sfx in a zone folder will replace what is in continuum/graphics or continuum/sound for that zone only. People commonly put custom bomb gfx in their folders so they can see how big the prox/damage is on bombs. (I use high visibility bullets myself).