The documentation asks for a PEM format certificate, but I haven’t been supplied with a certificate in this format.

The Apache SSL documentation and the documents for the SSLeay toolkit refer to certificates and certificate requests as "PEM" (Privacy-Enhanced Mail) files. They are not. ApacheSSL, like all SSL secure servers, uses the standard X.509 certificate format. SSLeay stores them in BASE64 encoded format, between “-----BEGIN-----" and “-----END-----" lines. BASE64 encoding was defined as part of the old Privacy Enhanced Mail (PEM) specification, which is why the documentation calls them "PEM format" files. Do not select this format! Instead, use the default "Standard" format, which is the BASE64 encoded X.509 certificate.