diff --git a/CLI11.hpp.in b/CLI11.hpp.in
index 0c9e1ee2..edc16bb1 100644
--- a/CLI11.hpp.in
+++ b/CLI11.hpp.in
@@ -40,8 +40,6 @@
 
 {macros_hpp}
 
-{slim_windows_h_hpp}
-
 {validators_hpp_filesystem}
 
 {encoding_includes}
diff --git a/include/CLI/impl/Argv_inl.hpp b/include/CLI/impl/Argv_inl.hpp
index f19849e2..771154ff 100644
--- a/include/CLI/impl/Argv_inl.hpp
+++ b/include/CLI/impl/Argv_inl.hpp
@@ -19,14 +19,28 @@
 #include <vector>
 // [CLI11:public_includes:end]
 
-#ifdef _WIN32
-#include "SlimWindowsH.hpp"
-#endif  // _WIN32
-
 // [CLI11:argv_inl_includes:verbatim]
 #if defined(_WIN32)
-#include <processenv.h>
+#if !(defined(_AMD64_) || defined(_X86_) || defined(_ARM_))
+#if defined(__amd64__) || defined(__amd64) || defined(__x86_64__) || defined(__x86_64) || defined(_M_X64) ||           \
+    defined(_M_AMD64)
+#define _AMD64_
+#elif defined(i386) || defined(__i386) || defined(__i386__) || defined(__i386__) || defined(_M_IX86)
+#define _X86_
+#elif defined(__arm__) || defined(_M_ARM) || defined(_M_ARMT)
+#define _ARM_
+#endif
+#endif
+#define NOMINMAX
+// first
+#include <windef.h>
+// second
+#include <winbase.h>
+// third
+#include <processthreadsapi.h>
 #include <shellapi.h>
+
+#undef NOMINMAX
 #elif defined(__APPLE__)
 #include <crt_externs.h>
 #endif
diff --git a/include/CLI/impl/SlimWindowsH.hpp b/include/CLI/impl/SlimWindowsH.hpp
deleted file mode 100644
index 1a8d7feb..00000000
--- a/include/CLI/impl/SlimWindowsH.hpp
+++ /dev/null
@@ -1,101 +0,0 @@
-// Copyright (c) 2017-2023, University of Cincinnati, developed by Henry Schreiner
-// under NSF AWARD 1414736 and by the respective contributors.
-// All rights reserved.
-//
-// SPDX-License-Identifier: BSD-3-Clause
-
-#pragma once
-// [CLI11:slim_windows_h_hpp:verbatim]
-#ifdef _WIN32
-// The most slimmed-down version of Windows.h.
-#define WIN32_LEAN_AND_MEAN
-#define WIN32_EXTRA_LEAN
-
-// Enable components based on necessity.
-#define NOGDICAPMASKS
-#define NOVIRTUALKEYCODES
-#define NOWINMESSAGES
-#define NOWINSTYLES
-#define NOSYSMETRICS
-#define NOMENUS
-#define NOICONS
-#define NOKEYSTATES
-#define NOSYSCOMMANDS
-#define NORASTEROPS
-#define NOSHOWWINDOW
-#define OEMRESOURCE
-#define NOATOM
-#define NOCLIPBOARD
-#define NOCOLOR
-#define NOCTLMGR
-#define NODRAWTEXT
-#define NOGDI
-#define NOKERNEL
-#define NOUSER
-#define NONLS
-#define NOMB
-#define NOMEMMGR
-#define NOMETAFILE
-#define NOMINMAX
-#define NOMSG
-#define NOOPENFILE
-#define NOSCROLL
-#define NOSERVICE
-#define NOSOUND
-#define NOTEXTMETRIC
-#define NOWH
-#define NOWINOFFSETS
-#define NOCOMM
-#define NOKANJI
-#define NOHELP
-#define NOPROFILER
-#define NODEFERWINDOWPOS
-#define NOMCX
-
-#include "Windows.h"
-
-#undef WIN32_LEAN_AND_MEAN
-#undef WIN32_EXTRA_LEAN
-
-#undef NOGDICAPMASKS
-#undef NOVIRTUALKEYCODES
-#undef NOWINMESSAGES
-#undef NOWINSTYLES
-#undef NOSYSMETRICS
-#undef NOMENUS
-#undef NOICONS
-#undef NOKEYSTATES
-#undef NOSYSCOMMANDS
-#undef NORASTEROPS
-#undef NOSHOWWINDOW
-#undef OEMRESOURCE
-#undef NOATOM
-#undef NOCLIPBOARD
-#undef NOCOLOR
-#undef NOCTLMGR
-#undef NODRAWTEXT
-#undef NOGDI
-#undef NOKERNEL
-#undef NOUSER
-#undef NONLS
-#undef NOMB
-#undef NOMEMMGR
-#undef NOMETAFILE
-#undef NOMINMAX
-#undef NOMSG
-#undef NOOPENFILE
-#undef NOSCROLL
-#undef NOSERVICE
-#undef NOSOUND
-#undef NOTEXTMETRIC
-#undef NOWH
-#undef NOWINOFFSETS
-#undef NOCOMM
-#undef NOKANJI
-#undef NOHELP
-#undef NOPROFILER
-#undef NODEFERWINDOWPOS
-#undef NOMCX
-
-#endif  // _WIN32
-// [CLI11:slim_windows_h_hpp:end]
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 89eb7e11..2c2aafa1 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -28,8 +28,7 @@ set(CLI11_impl_headers
     ${CLI11_implLoc}/StringTools_inl.hpp
     ${CLI11_implLoc}/Validators_inl.hpp
     ${CLI11_implLoc}/Encoding_inl.hpp
-    ${CLI11_implLoc}/Argv_inl.hpp
-    ${CLI11_implLoc}/SlimWindowsH.hpp)
+    ${CLI11_implLoc}/Argv_inl.hpp)
 
 set(CLI11_library_headers ${CLI11_headerLoc}/CLI.hpp ${CLI11_headerLoc}/Timer.hpp)