From 87e48df64e2d0846623598c38342ff564c03f8a4 Mon Sep 17 00:00:00 2001
From: yhirose <yuji.hirose.bug@gmail.com>
Date: Fri, 8 Aug 2025 21:53:44 -0400
Subject: [PATCH] Fix #2198

---
 httplib.h | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/httplib.h b/httplib.h
index 52b1b829f7..9d8a4b27fe 100644
--- a/httplib.h
+++ b/httplib.h
@@ -3078,8 +3078,24 @@ inline bool mmap::open(const char *path) {
   auto wpath = u8string_to_wstring(path);
   if (wpath.empty()) { return false; }
 
-  hFile_ = ::CreateFile2(wpath.c_str(), GENERIC_READ, FILE_SHARE_READ,
-                         OPEN_EXISTING, NULL);
+  static std::once_flag create_file2_check_flag;
+  static bool has_CreateFile2 = false;
+
+  std::call_once(create_file2_check_flag, []() {
+    auto hKernel32 = GetModuleHandleW(L"kernel32.dll");
+    if (hKernel32) {
+      auto pCreateFile2 = GetProcAddress(hKernel32, "CreateFile2");
+      if (pCreateFile2) { has_CreateFile2 = true; }
+    }
+  });
+
+  if (has_CreateFile2) {
+    hFile_ = ::CreateFile2(wpath.c_str(), GENERIC_READ, FILE_SHARE_READ,
+                           OPEN_EXISTING, NULL);
+  } else {
+    hFile_ = ::CreateFileW(wpath.c_str(), GENERIC_READ, FILE_SHARE_READ, NULL,
+                           OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
+  }
 
   if (hFile_ == INVALID_HANDLE_VALUE) { return false; }