OpenSSL bitcoin addresses generation

[Bitcoin]

OpenSSL bitcoin addresses generation

Using OpenSSL ver 1.1.0h on win 8.1 - 32 bit

Im trying to recreate this post using cmd: OpenSSL generate Bitcoin address

But on step 3:

openssl ec -in c:\keys\private.pem -outform DER|tail -c +8|head -c 32|xxd -p -c 32 > c:\keys\private.key

I got this error: ec: Unknown cipher c

Any idea what im doing going wrong?

Source: OpenSSL bitcoin addresses generation