Decrypting Secure Strings

echo "01000000d08c9ddf0115d1118c7a00c04fc2..." > cred.txt
$pw = Get-Content cred.txt | ConvertTo-SecureString
$bstr = [System.Runtime.InteropServices.Marshal]::SecureStringToBSTR($pw)
$UnsecurePassword = [System.Runtime.InteropServices.Marshal]::PtrToStringAuto($bstr)
$UnsecurePassword

Should convert the secure string to plaintext