RegLoadAppKeyW

// ADVAPI32.dll  (Unicode / -W)
#include <windows.h>

WIN32_ERROR RegLoadAppKeyW(
    LPCWSTR lpFile,
    HKEY* phkResult,
    DWORD samDesired,
    DWORD dwOptions,
    DWORD Reserved   // optional
);

<DllImport("ADVAPI32.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function RegLoadAppKeyW(
    <MarshalAs(UnmanagedType.LPWStr)> lpFile As String,   ' LPCWSTR
    phkResult As IntPtr,   ' HKEY* out
    samDesired As UInteger,   ' DWORD
    dwOptions As UInteger,   ' DWORD
    Reserved As UInteger   ' DWORD optional
) As UInteger
End Function

' lpFile : LPCWSTR
' phkResult : HKEY* out
' samDesired : DWORD
' dwOptions : DWORD
' Reserved : DWORD optional
Declare PtrSafe Function RegLoadAppKeyW Lib "advapi32" ( _
    ByVal lpFile As LongPtr, _
    ByVal phkResult As LongPtr, _
    ByVal samDesired As Long, _
    ByVal dwOptions As Long, _
    ByVal Reserved As Long) As Long
' Unicode(W): 文字列は ByVal As LongPtr とし StrPtr(unicodeStr) を渡す
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

RegLoadAppKeyW = ctypes.windll.advapi32.RegLoadAppKeyW
RegLoadAppKeyW.restype = wintypes.DWORD
RegLoadAppKeyW.argtypes = [
    wintypes.LPCWSTR,  # lpFile : LPCWSTR
    ctypes.c_void_p,  # phkResult : HKEY* out
    wintypes.DWORD,  # samDesired : DWORD
    wintypes.DWORD,  # dwOptions : DWORD
    wintypes.DWORD,  # Reserved : DWORD optional
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('ADVAPI32.dll')
RegLoadAppKeyW = Fiddle::Function.new(
  lib['RegLoadAppKeyW'],
  [
    Fiddle::TYPE_VOIDP,  # lpFile : LPCWSTR
    Fiddle::TYPE_VOIDP,  # phkResult : HKEY* out
    -Fiddle::TYPE_INT,  # samDesired : DWORD
    -Fiddle::TYPE_INT,  # dwOptions : DWORD
    -Fiddle::TYPE_INT,  # Reserved : DWORD optional
  ],
  -Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "advapi32")]
extern "system" {
    fn RegLoadAppKeyW(
        lpFile: *const u16,  // LPCWSTR
        phkResult: *mut *mut core::ffi::c_void,  // HKEY* out
        samDesired: u32,  // DWORD
        dwOptions: u32,  // DWORD
        Reserved: u32  // DWORD optional
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("ADVAPI32.dll", CharSet = CharSet.Unicode)]
public static extern uint RegLoadAppKeyW([MarshalAs(UnmanagedType.LPWStr)] string lpFile, IntPtr phkResult, uint samDesired, uint dwOptions, uint Reserved);
"@
$api = Add-Type -MemberDefinition $sig -Name 'ADVAPI32_RegLoadAppKeyW' -Namespace Win32 -PassThru
# $api::RegLoadAppKeyW(lpFile, phkResult, samDesired, dwOptions, Reserved)

#uselib "ADVAPI32.dll"
#func global RegLoadAppKeyW "RegLoadAppKeyW" wptr, wptr, wptr, wptr, wptr
; RegLoadAppKeyW lpFile, phkResult, samDesired, dwOptions, Reserved   ; 戻り値は stat
; lpFile : LPCWSTR -> "wptr"
; phkResult : HKEY* out -> "wptr"
; samDesired : DWORD -> "wptr"
; dwOptions : DWORD -> "wptr"
; Reserved : DWORD optional -> "wptr"
; ※HSP3.7は #func のため戻り値はシステム変数 stat に格納されます。

#uselib "ADVAPI32.dll"
#cfunc global RegLoadAppKeyW "RegLoadAppKeyW" wstr, sptr, int, int, int
; res = RegLoadAppKeyW(lpFile, phkResult, samDesired, dwOptions, Reserved)
; lpFile : LPCWSTR -> "wstr"
; phkResult : HKEY* out -> "sptr"
; samDesired : DWORD -> "int"
; dwOptions : DWORD -> "int"
; Reserved : DWORD optional -> "int"

; WIN32_ERROR RegLoadAppKeyW(LPCWSTR lpFile, HKEY* phkResult, DWORD samDesired, DWORD dwOptions, DWORD Reserved)
#uselib "ADVAPI32.dll"
#cfunc global RegLoadAppKeyW "RegLoadAppKeyW" wstr, intptr, int, int, int
; res = RegLoadAppKeyW(lpFile, phkResult, samDesired, dwOptions, Reserved)
; lpFile : LPCWSTR -> "wstr"
; phkResult : HKEY* out -> "intptr"
; samDesired : DWORD -> "int"
; dwOptions : DWORD -> "int"
; Reserved : DWORD optional -> "int"

import (
	"golang.org/x/sys/windows"
	"unsafe"
)

var (
	advapi32 = windows.NewLazySystemDLL("ADVAPI32.dll")
	procRegLoadAppKeyW = advapi32.NewProc("RegLoadAppKeyW")
)

// lpFile (LPCWSTR), phkResult (HKEY* out), samDesired (DWORD), dwOptions (DWORD), Reserved (DWORD optional)
r1, _, err := procRegLoadAppKeyW.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(lpFile))),
	uintptr(phkResult),
	uintptr(samDesired),
	uintptr(dwOptions),
	uintptr(Reserved),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // WIN32_ERROR

function RegLoadAppKeyW(
  lpFile: PWideChar;   // LPCWSTR
  phkResult: Pointer;   // HKEY* out
  samDesired: DWORD;   // DWORD
  dwOptions: DWORD;   // DWORD
  Reserved: DWORD   // DWORD optional
): DWORD; stdcall;
  external 'ADVAPI32.dll' name 'RegLoadAppKeyW';

result := DllCall("ADVAPI32\RegLoadAppKeyW"
    , "WStr", lpFile   ; LPCWSTR
    , "Ptr", phkResult   ; HKEY* out
    , "UInt", samDesired   ; DWORD
    , "UInt", dwOptions   ; DWORD
    , "UInt", Reserved   ; DWORD optional
    , "UInt")   ; return: WIN32_ERROR

●RegLoadAppKeyW(lpFile, phkResult, samDesired, dwOptions, Reserved) = DLL("ADVAPI32.dll", "dword RegLoadAppKeyW(char*, void*, dword, dword, dword)")
# 呼び出し: RegLoadAppKeyW(lpFile, phkResult, samDesired, dwOptions, Reserved)
# lpFile : LPCWSTR -> "char*"
# phkResult : HKEY* out -> "void*"
# samDesired : DWORD -> "dword"
# dwOptions : DWORD -> "dword"
# Reserved : DWORD optional -> "dword"
# なでしこ1は32bit・ANSI(Shift_JIS)。文字列=char*(ANSI)、ポインタ/ハンドル=void*(4byte)。
# ※-W(Unicode)関数。なでしこ1はANSIのため -A 版の利用を推奨。