How to Convert CRT SSL Certificate to PEM Using OpenSSL
You now need to use Openssl to extract the private key. You can view the project here. The windows implementation has been done by Shining Light Productions and you can download Win32 OpenSSL here
This guide will use Win32 OpenSSL as reference, good job Thomas!
1. Once you have installed Win32 OpenSSL, start the cmd prompt as administrator and navigate to the install location i.e. C:\OpenSSL-Win64\bin
2. Type openssl to run
Here are the commands using a multi domain SSL certificate for an example
1. Convert from .crt to .pem.
openssl x509 -in "E:\MultiDomainSSLCert.crt" -out "E:\MultiDomainSSLCert.pem" -outform pem