<PackageReference Include="Microsoft.Win32.Registry" Version="4.6.0-preview6.19264.9" />

RegistryValueOptions

public enum RegistryValueOptions
Specifies optional behavior when retrieving name/value pairs from a registry key.
using System; namespace Microsoft.Win32 { [Flags] public enum RegistryValueOptions { None = 0, DoNotExpandEnvironmentNames = 1 } }