Oh, I know you knew that. I'm more wondering, what do we do about it? Recommend a caution message if an audio file of the same song name exists?
When anyone renders a wav file to disk he should be asked to name it and its location. Then if he wants to load it onto the audio track it should ask where is the file and what is its name. Once it is loaded and saved on a track it should remember it and load it automatically the next time the file is opened.
Pretty standard file and track management.