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Dump wifi information and keys in the terminal:

powershell -ep ByP -c "(netsh wlan show profiles) | Select-String '\:(.+)$' | %{$name=$_.Matches.Groups[1].Value.Trim(); $_} | %{(netsh wlan show profile name=$name key=clear)}"

Redirect the output to a file:

powershell -ep ByP -c "(netsh wlan show profiles) | Select-String '\:(.+)$' | %{$name=$_.Matches.Groups[1].Value.Trim(); $_} | %{(netsh wlan show profile name=$name key=clear)} > wifipass.txt"