<PackageReference Include="NETStandard.Library" Version="2.0.1" />

System.Security.Cryptography.X509Certificates.OpenFlags

public enum OpenFlags
namespace System.Security.Cryptography.X509Certificates { public enum OpenFlags { IncludeArchived = 8, MaxAllowed = 2, OpenExistingOnly = 4, ReadOnly = 0, ReadWrite = 1 } }