All certificates (Codesign and SSL) can be managed with the application DigiCertUtil.exe.

When you buy a cert, you often only get a cert file; importing is no problem, but exporting it as pfx is impossible in std windows. Use DigiCertUtil for this.

For developing, use localhost - to allow Chrome to bypass the need for a valid certificate, enter this into the browser for https/SSL:

chrome://flags/#allow-insecure-localhost