.pfx archive including the certificate, its private key and the chain,
and places it in the path provided by the
--pfxfilepath parameter, or the
Store.PfxFile.DefaultPath setting in settings.json.
By default the file name will be the common name of the certificate (i.e.
the primary host name), but this may be overruled with the
--store pfxfile [--pfxpassword *****] [--pfxfilepath C:\Certificates\] [--pfxfilename mycert]