VNC Pass View is a small utility, totally free and does not even require installation, which will allow you to recover the password stored in the VNC program.
Actually, VNC Pass View allows you to recover two types of passwords: on the one hand, the one stored by the user that is at that moment identified (that is, the HKEY_CURRENT_USER information in the Registry), and on the other, all those passwords stored by all the users.
For the correct operation of VNC Pass View you do not need to have any additional DLL. Although the program is in English, on the author's website you will find small modules for translation into other languages.
You can free download VNC Pass View 32, 64 bit and safe install the latest trial or new full version for Windows 10 from the official site.