NtLoadKey3 - NtDoc

#ifndef _NTREGAPI_H
#if (PHNT_VERSION >= PHNT_20H1)

// rev by tyranid
/**
 * Loads a registry key from a file with extended parameters.
 * 
 * @param[in] TargetKey A pointer to an OBJECT_ATTRIBUTES structure that specifies the target key.
 * @param[in] SourceFile A pointer to an OBJECT_ATTRIBUTES structure that specifies the source file.
 * @param[in] Flags The options to use when loading the key.
 * @param[in] ExtendedParameters A pointer to an array of extended parameters.
 * @param[in] ExtendedParameterCount The number of extended parameters.
 * @param[in, optional] DesiredAccess The access mask that specifies the desired access rights.
 * @param[out, optional] RootHandle A pointer to a handle that receives the root handle.
 * @param[in, reserved] Reserved Reserved.
 * @return NTSTATUS Successful or errant status.
 */
NTSYSCALLAPI
NTSTATUS
NTAPI
NtLoadKey3(
    _In_ POBJECT_ATTRIBUTES TargetKey,
    _In_ POBJECT_ATTRIBUTES SourceFile,
    _In_ ULONG Flags,
    _In_reads_(ExtendedParameterCount) PCM_EXTENDED_PARAMETER ExtendedParameters,
    _In_ ULONG ExtendedParameterCount,
    _In_opt_ ACCESS_MASK DesiredAccess,
    _Out_opt_ PHANDLE RootHandle,
    _Reserved_ PVOID Reserved
    );

#endif
#endif
View code on GitHub

#ifndef _NTZWAPI_H

NTSYSCALLAPI
NTSTATUS
NTAPI
ZwLoadKey3(
    _In_ POBJECT_ATTRIBUTES TargetKey,
    _In_ POBJECT_ATTRIBUTES SourceFile,
    _In_ ULONG Flags,
    _In_reads_(ExtendedParameterCount) PCM_EXTENDED_PARAMETER ExtendedParameters,
    _In_ ULONG ExtendedParameterCount,
    _In_opt_ ACCESS_MASK DesiredAccess,
    _Out_opt_ PHANDLE RootHandle,
    _Reserved_ PVOID Reserved
    );

#endif
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