VNCPassView is a small utility that recover the passwords stored by the VNC tool. It can recover 2 of passwords: password stored for the current logged-on user (HKEY_CURRENT_USER in the Registry), and password stored for the all users.
Using VNCPassView
This utility doesn't require any installaion process or additional DLLs. Just run the executable file (VNCPassView.exe), and the VNC passwords will be displayed, if they are stored on your computer.