Gets a collection of System.Security.Cryptography.X509Certificates.X509Extension objects.
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The extensions defined in the X.509 v3 certificate format allow additional data to be included in the certificate. A number of extensions are defined by ISO in the X.509 v3 definition as well as by PKIX in RFC 3280, "tp://go.microsoft.com/fwlink/?LinkId=45286." Common extensions include information regarding key usage (System.Security.Cryptography.X509Certificates.X509KeyUsageExtension), key identifiers (System.Security.Cryptography.X509Certificates.X509SubjectKeyIdentifierExtension), certificate policies, revocation information (CRL Distribution Point extension), and other uses.