If you have OpenSSL, open system log in web console ("get system log") then copy the data between "<password>" tags. Use as input to this pipeline:
base64 is GNU coreutils base64. Openssl enc -base64 does not work since (I think) the data is not properly wrapped.
Alternatively you can just use "get windows password" and paste your plaintext private key there. I think that totally defeats the purpose of having a key pair...
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