For editing the VNCTool passwords
You’ll need a hex editor. Use this
http://www.hhdsoftware.com/Products/home/hex-editor-free.html
open up one of the VNC files like
VNCNewBuild.exe
And do a search like the following:

Hex

Important you put a . with the search string when searching and tick the Regular expression box or it won’t find the password you want to edit and then you have to spend ages looking for it.
Edit the password and then just Save As. and you’re done.
Simple.