The (Privacy Enhanced Mail) Base 64 Encoded (.pem) certificates are supported.
To convert into this format from other format types, the openssl command-line tool could be used from official OpenSSL website.
To convert from Personal Information Exchange, PKCS#12 (.pfx) to Base64 Encoded (.pem), invoke the following command on the PFX file:
openssl pkcs12 -in <file_name> .pfx -out <file_name>.pem -nodes
