View WiFi passwords using Command Prompt

Open the command prompt (Windows Key + R + type CMD + ENTER)

Run the following command to show all the Wifi profiles on your computer:
netsh wlan show profiles

Now run the following command to reveal the Wifi password content for all Wifi profile:
netsh wlan show profile name=WifiConnectionName key=clear
Replace WifiConnectionName with Wifi SSID which you can find from the above command.

See Key Content then copy the password.