Certificates
What is SSL certificate Chain
https://support.dnsimple.com/articles/what-is-ssl-certificate-chain/
intermediate CA
Storage of Keys and Certificates
https://en.wikipedia.org/wiki/PKCS_12
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.p12
corresponding tool is openssl
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.pfx
microsoft version
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.pem
lists the certificates and possibly private keys as Base 64 strings in a text file
list of all kinds of files and contents
https://blogs.msdn.microsoft.com/kaushal/2010/11/04/various-ssltls-certificate-file-typesextensions/