NavTweak and NavSpeak it's a programs intended to change various things in 'navboot' and sound files.
NavTweak 2.6 (49 KB):
http://rapidshare.com/files/8925524/navtweak.zip.html
NavSpeak 1.0 (23 KB):
http://rapidshare.com/files/8925664/navspeak.zip.html
Both programs requires the GTK+/Win32 Runtime Environment (5.2 MB):
http://gladewin32.sourceforge.net/
THE PROGRAMS PROVIDED “AS IS” WITHOUT WARRANTY OF ANY KIND.
USE IT AT YOUR OWN RISK !