1) In Windows, right click on the SSL certificate and export to .PFX
2) On Linux, convert the .PFX file into .CRT, ca_bundle and .KEY file.
openssl pkcs12 -in cert.pfx -nocerts -out cert.key openssl pkcs12 -in cert.pfx -clcerts -nokeys -out cert.crt openssl pkcs12 -in cert.pfx -nodes -nokeys -passin pass:mypassword -out ca_bundle.pem
See also: https://www.markbrilman.nl/2011/08/howto-convert-a-pfx-to-a-seperate-key-crt-file/