diff --git a/httplib.h b/httplib.h
index 749fa61..f3b714b 100644
--- a/httplib.h
+++ b/httplib.h
@@ -3057,8 +3057,13 @@ 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);
+  #if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_APP | WINAPI_PARTITION_SYSTEM | WINAPI_PARTITION_GAMES) && (_WIN32_WINNT >= _WIN32_WINNT_WIN8)
+    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);
+  #endif
 
   if (hFile_ == INVALID_HANDLE_VALUE) { return false; }