It is located in the dynamic link library called imageres.dll in c:\Windows\sytem32
You can edit this with a program called Resource Hacker
For Info and download links go to
Resource Hacker
go into the folder WAVE after opening imageres.dll with reshacker and open 5051 or whatever folder is inside WAVE. either delete it or replace it with something else.
WARNING: the replacement must be a .wav file and i have never deleted it before.
Good luck