GetCurrentPackagePath2

// api-ms-win-appmodel-runtime-l1-1-3.dll
#include <windows.h>

WIN32_ERROR GetCurrentPackagePath2(
    PackagePathType packagePathType,
    DWORD* pathLength,
    LPWSTR path   // optional
);

<DllImport("api-ms-win-appmodel-runtime-l1-1-3.dll", ExactSpelling:=True)>
Public Shared Function GetCurrentPackagePath2(
    packagePathType As Integer,   ' PackagePathType
    ByRef pathLength As UInteger,   ' DWORD* in/out
    <MarshalAs(UnmanagedType.LPWStr)> path As System.Text.StringBuilder   ' LPWSTR optional, out
) As UInteger
End Function

' packagePathType : PackagePathType
' pathLength : DWORD* in/out
' path : LPWSTR optional, out
Declare PtrSafe Function GetCurrentPackagePath2 Lib "api-ms-win-appmodel-runtime-l1-1-3" ( _
    ByVal packagePathType As Long, _
    ByRef pathLength As Long, _
    ByVal path As LongPtr) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

GetCurrentPackagePath2 = ctypes.windll.LoadLibrary("api-ms-win-appmodel-runtime-l1-1-3.dll").GetCurrentPackagePath2
GetCurrentPackagePath2.restype = wintypes.DWORD
GetCurrentPackagePath2.argtypes = [
    ctypes.c_int,  # packagePathType : PackagePathType
    ctypes.POINTER(wintypes.DWORD),  # pathLength : DWORD* in/out
    wintypes.LPWSTR,  # path : LPWSTR optional, out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('api-ms-win-appmodel-runtime-l1-1-3.dll')
GetCurrentPackagePath2 = Fiddle::Function.new(
  lib['GetCurrentPackagePath2'],
  [
    Fiddle::TYPE_INT,  # packagePathType : PackagePathType
    Fiddle::TYPE_VOIDP,  # pathLength : DWORD* in/out
    Fiddle::TYPE_VOIDP,  # path : LPWSTR optional, out
  ],
  -Fiddle::TYPE_INT)

#[link(name = "api-ms-win-appmodel-runtime-l1-1-3")]
extern "system" {
    fn GetCurrentPackagePath2(
        packagePathType: i32,  // PackagePathType
        pathLength: *mut u32,  // DWORD* in/out
        path: *mut u16  // LPWSTR optional, out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("api-ms-win-appmodel-runtime-l1-1-3.dll")]
public static extern uint GetCurrentPackagePath2(int packagePathType, ref uint pathLength, [MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder path);
"@
$api = Add-Type -MemberDefinition $sig -Name 'api-ms-win-appmodel-runtime-l1-1-3_GetCurrentPackagePath2' -Namespace Win32 -PassThru
# $api::GetCurrentPackagePath2(packagePathType, pathLength, path)

#uselib "api-ms-win-appmodel-runtime-l1-1-3.dll"
#func global GetCurrentPackagePath2 "GetCurrentPackagePath2" sptr, sptr, sptr
; GetCurrentPackagePath2 packagePathType, varptr(pathLength), varptr(path)   ; 戻り値は stat
; packagePathType : PackagePathType -> "sptr"
; pathLength : DWORD* in/out -> "sptr"
; path : LPWSTR optional, out -> "sptr"
; ※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 "api-ms-win-appmodel-runtime-l1-1-3.dll"
#cfunc global GetCurrentPackagePath2 "GetCurrentPackagePath2" int, var, var
; res = GetCurrentPackagePath2(packagePathType, pathLength, path)
; packagePathType : PackagePathType -> "int"
; pathLength : DWORD* in/out -> "var"
; path : LPWSTR optional, out -> "var"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。

; WIN32_ERROR GetCurrentPackagePath2(PackagePathType packagePathType, DWORD* pathLength, LPWSTR path)
#uselib "api-ms-win-appmodel-runtime-l1-1-3.dll"
#cfunc global GetCurrentPackagePath2 "GetCurrentPackagePath2" int, var, var
; res = GetCurrentPackagePath2(packagePathType, pathLength, path)
; packagePathType : PackagePathType -> "int"
; pathLength : DWORD* in/out -> "var"
; path : LPWSTR optional, out -> "var"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。

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

var (
	api_ms_win_appmodel_runtime_l1_1_3 = windows.NewLazySystemDLL("api-ms-win-appmodel-runtime-l1-1-3.dll")
	procGetCurrentPackagePath2 = api_ms_win_appmodel_runtime_l1_1_3.NewProc("GetCurrentPackagePath2")
)

// packagePathType (PackagePathType), pathLength (DWORD* in/out), path (LPWSTR optional, out)
r1, _, err := procGetCurrentPackagePath2.Call(
	uintptr(packagePathType),
	uintptr(pathLength),
	uintptr(path),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // WIN32_ERROR

function GetCurrentPackagePath2(
  packagePathType: Integer;   // PackagePathType
  pathLength: Pointer;   // DWORD* in/out
  path: PWideChar   // LPWSTR optional, out
): DWORD; stdcall;
  external 'api-ms-win-appmodel-runtime-l1-1-3.dll' name 'GetCurrentPackagePath2';

result := DllCall("api-ms-win-appmodel-runtime-l1-1-3\GetCurrentPackagePath2"
    , "Int", packagePathType   ; PackagePathType
    , "Ptr", pathLength   ; DWORD* in/out
    , "Ptr", path   ; LPWSTR optional, out
    , "UInt")   ; return: WIN32_ERROR

●GetCurrentPackagePath2(packagePathType, pathLength, path) = DLL("api-ms-win-appmodel-runtime-l1-1-3.dll", "dword GetCurrentPackagePath2(int, void*, char*)")
# 呼び出し: GetCurrentPackagePath2(packagePathType, pathLength, path)
# packagePathType : PackagePathType -> "int"
# pathLength : DWORD* in/out -> "void*"
# path : LPWSTR optional, out -> "char*"
# 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)。