You can try this:
1. Export the ssl certificate as .CER {DER encoded binary X.509}. e.g Certificate.cer
(Procedure, Just in case: On IE, Internet Options-> content->ssl certificates)
2. Using openssl run this command: openssl x509 -inform der -in Certificate.cer -out certificate.pem
Where by Certificate.cer is the path to the Certificate.cer exported e.g C:\Certificate.cer and certificate.pem is the file path to where u want to save your pem file. e.g C:\certificate.pem.
Hope that helps.