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

/**
 * The NtGetMUIRegistryInfo routine retrieves Multilingual User Interface (MUI)
 * configuration data from the system registry.
 *
 * \param Flags Flags that control the type of MUI information returned.
 * \param DataSize On input, the size of the buffer pointed to by Data.
 * On output, the required or actual size of the data returned.
 * \param Data A pointer to the MUI registry information.
 * \return NTSTATUS Successful or errant status.
 * \remarks This routine is private and subject to change.
 */
NTSYSCALLAPI
NTSTATUS
NTAPI
NtGetMUIRegistryInfo(
    _In_ ULONG Flags,
    _Inout_ PULONG DataSize,
    _Out_ PVOID Data
    );

// 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