If you cannot find the existing wav or other media file Norton is playing it may not be possible to change it. In commercial software I write some wav files are simply shipped as is and appear in the program files directory or application data directory, but some I embed in larger data files. If Norton do the latter then you are out of luck. If the former simply put your file there replacing the existing file naming your file the same as theirs.
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I've left WP indefinitely.