Importing Sounds - Why do they revert?

I'm trying to use Worldedit->Sound Editor->Replace Internal Sound to change the attack/yes/etc. sounds for a blademaster hero. Whenever I save the map, the sounds revert to the originals.

I tried changing the path in the import manager, same thing. It works until the map is saved, then it reverts.

This has come up before. But I haven't seen a real answer:

http://www.wc3campaigns.net/showthread.php?t=35181

It works for me.

Oh it's not actually changing back to the original sound, it's just when you play it before restarting the editor it plays the old sound, and it will work if you test the map. Basicly just save it and restart the editor then you will hear the new sound.