RtlGetUserPreferredUILanguages - NtDoc

#ifndef _NTRTL_H
#if (PHNT_VERSION >= PHNT_WIN7)

// rev from GetUserPreferredUILanguages
NTSYSAPI
NTSTATUS
NTAPI
RtlGetUserPreferredUILanguages(
    _In_ ULONG Flags, // MUI_LANGUAGE_NAME
    _In_opt_ PCWSTR LocaleName,
    _Out_ PULONG NumberOfLanguages,
    _Out_writes_opt_(*ReturnLength) PZZWSTR Languages,
    _Inout_ PULONG ReturnLength
    );

#endif
#endif
View code on GitHub