I am also using Root Explorer, thanks for pointing out where that file was, saved me some search time
Just rooted today, so there may have been an update since then.
But if you tap the white button that says "Mount R/W" then you have just ENABLED Read/Write permissions.
I was able to delete the sound file with no problem, no need to replace either.
After I did that maybe 2min later my phone did randomly quick restart into a lost signal,
but I fixed that by just a simple hard restart, phone back to normal, and none of that crap shutter sound!!! So Annoying!!!