NtGetMUIRegistryInfo - NtDoc

#ifndef _NTEXAPI_H
#if (PHNT_MODE != PHNT_MODE_KERNEL)
// NLS
// begin_private
#if (PHNT_VERSION >= PHNT_VISTA)

NTSYSCALLAPI
NTSTATUS
NTAPI
NtGetMUIRegistryInfo(
    _In_ ULONG Flags,
    _Inout_ PULONG DataSize,
    _Out_ PVOID Data
    );

#endif
// end_private
#endif
#endif
View code on GitHub

#ifndef _NTZWAPI_H

NTSYSCALLAPI
NTSTATUS
NTAPI
ZwGetMUIRegistryInfo(
    _In_ ULONG Flags,
    _Inout_ PULONG DataSize,
    _Out_ PVOID Data
    );

#endif
View code on GitHub