VaultPasswordView is a simple tool for Windows 10/8/7 that decrypts and displays the passwords and other data stored inside ‘Windows Vault’. You can use it to decrypt the Windows Vault data of your currently running system, as well as the Windows Vault data stored on external hard drive.

Windows vault files are stored in the following folders:

• C:\Users\[User Profile]\AppData\Local\Microsoft\Vault
• C:\ProgramData\Microsoft\Vault
• C:\Windows\system32\config\systemprofile\AppData\Local\Microsoft\Vault

Inside these vault folders, there is Policy.vpol filename that contains the encryption key. The encryption key is used to decrypt the .vcrd files in the same vault folder.

You can read more and download this tool over here: https://www.nirsoft.net/utils/vault_password_view.html