diff --git C/7zVersion.rc C/7zVersion.rc
index 6ed26de7445..675e9bb0321 100755
--- C/7zVersion.rc
+++ C/7zVersion.rc
@@ -5,7 +5,7 @@
 #define MY_VFT_APP  0x00000001L
 #define MY_VFT_DLL  0x00000002L
 
-// #include <WinVer.h>
+// #include <winver.h>
 
 #ifndef MY_VERSION
 #include "7zVersion.h"
diff --git C/7zip_gcc_c.mak C/7zip_gcc_c.mak
index d41810478db..43cdd51271e 100755
--- C/7zip_gcc_c.mak
+++ C/7zip_gcc_c.mak
@@ -93,7 +93,7 @@ DEL_OBJ_EXE = -$(RM) $(O)\*.o $(O)\$(PROG).exe $(O)\$(PROG).dll
 endif
 
 
-LIB2 = -lOle32 -loleaut32 -luuid -ladvapi32 -lUser32
+LIB2 = -lole32 -loleaut32 -luuid -ladvapi32 -luser32
 
 CXXFLAGS_EXTRA = -DUNICODE -D_UNICODE
 # -Wno-delete-non-virtual-dtor
diff --git C/Alloc.c C/Alloc.c
index 142a1ea2219..0d0107c56f4 100755
--- C/Alloc.c
+++ C/Alloc.c
@@ -6,7 +6,7 @@
 #include <stdio.h>
 
 #ifdef _WIN32
-#include <Windows.h>
+#include <windows.h>
 #endif
 #include <stdlib.h>
 
diff --git C/CpuArch.c C/CpuArch.c
index a0e93e8b08e..36e0be0b1c8 100755
--- C/CpuArch.c
+++ C/CpuArch.c
@@ -217,7 +217,7 @@ BoolInt CPU_Is_InOrder()
 }
 
 #if !defined(MY_CPU_AMD64) && defined(_WIN32)
-#include <Windows.h>
+#include <windows.h>
 static BoolInt CPU_Sys_Is_SSE_Supported()
 {
   OSVERSIONINFO vi;
@@ -275,7 +275,7 @@ BoolInt CPU_IsSupported_SHA()
 // #include <stdio.h>
 
 #ifdef _WIN32
-#include <Windows.h>
+#include <windows.h>
 #endif
 
 BoolInt CPU_IsSupported_AVX2()
@@ -351,7 +351,7 @@ BoolInt CPU_IsSupported_PageGB()
 
 #ifdef _WIN32
 
-#include <Windows.h>
+#include <windows.h>
 
 BoolInt CPU_IsSupported_CRC32()  { return IsProcessorFeaturePresent(PF_ARM_V8_CRC32_INSTRUCTIONS_AVAILABLE) ? 1 : 0; }
 BoolInt CPU_IsSupported_CRYPTO() { return IsProcessorFeaturePresent(PF_ARM_V8_CRYPTO_INSTRUCTIONS_AVAILABLE) ? 1 : 0; }
diff --git C/DllSecur.c C/DllSecur.c
index a37c1b3e2c5..16755bba930 100755
--- C/DllSecur.c
+++ C/DllSecur.c
@@ -5,7 +5,7 @@
 
 #ifdef _WIN32
 
-#include <Windows.h>
+#include <windows.h>
 
 #include "DllSecur.h"
 
diff --git C/Threads.h C/Threads.h
index e9493afff62..71972558d48 100755
--- C/Threads.h
+++ C/Threads.h
@@ -5,7 +5,7 @@
 #define __7Z_THREADS_H
 
 #ifdef _WIN32
-#include <Windows.h>
+#include <windows.h>
 #else
 
 #if defined(__linux__)
diff --git C/Util/7zipInstall/7zipInstall.c C/Util/7zipInstall/7zipInstall.c
index 2c498bb4392..d791bc4181c 100755
--- C/Util/7zipInstall/7zipInstall.c
+++ C/Util/7zipInstall/7zipInstall.c
@@ -10,7 +10,7 @@
 #endif
 
 #include <windows.h>
-#include <ShlObj.h>
+#include <shlobj.h>
 
 #include "../../7z.h"
 #include "../../7zAlloc.h"
diff --git C/Util/7zipInstall/resource.rc C/Util/7zipInstall/resource.rc
index 4d6a91feda1..c19f601f69f 100755
--- C/Util/7zipInstall/resource.rc
+++ C/Util/7zipInstall/resource.rc
@@ -1,6 +1,6 @@
 #include <winnt.h>
 #include <WinUser.h>
-#include <CommCtrl.h>
+#include <commctrl.h>
 
 #define USE_COPYRIGHT_CR
 #include "../../7zVersion.rc"
diff --git C/Util/7zipUninstall/7zipUninstall.c C/Util/7zipUninstall/7zipUninstall.c
index 89cd764dbe9..32ece1c6c14 100755
--- C/Util/7zipUninstall/7zipUninstall.c
+++ C/Util/7zipUninstall/7zipUninstall.c
@@ -11,7 +11,7 @@
 // #define SZ_ERROR_ABORT 100
 
 #include <windows.h>
-#include <ShlObj.h>
+#include <shlobj.h>
 
 #include "../../7zVersion.h"
 
diff --git C/Util/7zipUninstall/resource.rc C/Util/7zipUninstall/resource.rc
index 506e0665cdd..ae1dfedc83b 100755
--- C/Util/7zipUninstall/resource.rc
+++ C/Util/7zipUninstall/resource.rc
@@ -1,6 +1,6 @@
 #include <winnt.h>
 #include <WinUser.h>
-#include <CommCtrl.h>
+#include <commctrl.h>
 
 #define USE_COPYRIGHT_CR
 #include "../../7zVersion.rc"
diff --git CPP/7zip/7zip_gcc.mak CPP/7zip/7zip_gcc.mak
index 2a24e06aa1f..fb32b933201 100755
--- CPP/7zip/7zip_gcc.mak
+++ CPP/7zip/7zip_gcc.mak
@@ -113,8 +113,8 @@ MY_MKDIR=mkdir
 DEL_OBJ_EXE = -$(RM) $(O)\*.o $(O)\$(PROG).exe $(O)\$(PROG).dll
 endif
 
-LIB2_GUI = -lOle32 -lGdi32 -lComctl32 -lComdlg32 $(LIB_HTMLHELP)
-LIB2 = -loleaut32 -luuid -ladvapi32 -lUser32 $(LIB2_GUI)
+LIB2_GUI = -lole32 -lgdi32 -lcomctl32 -lcomdlg32 $(LIB_HTMLHELP)
+LIB2 = -loleaut32 -luuid -ladvapi32 -luser32 $(LIB2_GUI)
 
 CXXFLAGS_EXTRA = -DUNICODE -D_UNICODE
 # -Wno-delete-non-virtual-dtor
diff --git CPP/7zip/Bundles/Fm/StdAfx.h CPP/7zip/Bundles/Fm/StdAfx.h
index c15e07939da..d1e094cc339 100755
--- CPP/7zip/Bundles/Fm/StdAfx.h
+++ CPP/7zip/Bundles/Fm/StdAfx.h
@@ -9,8 +9,8 @@
 
 #include "../../../Common/Common.h"
 
-#include <CommCtrl.h>
-#include <ShlObj.h>
-#include <Shlwapi.h>
+#include <commctrl.h>
+#include <shlobj.h>
+#include <shlwapi.h>
 
 #endif
diff --git CPP/7zip/Bundles/SFXWin/SfxWin.cpp CPP/7zip/Bundles/SFXWin/SfxWin.cpp
index cf3bad389a0..260484c11e4 100755
--- CPP/7zip/Bundles/SFXWin/SfxWin.cpp
+++ CPP/7zip/Bundles/SFXWin/SfxWin.cpp
@@ -4,7 +4,7 @@
 
 #include "../../../Common/MyWindows.h"
 
-#include <Shlwapi.h>
+#include <shlwapi.h>
 
 #include "../../../Common/MyInitGuid.h"
 
diff --git CPP/7zip/Bundles/SFXWin/StdAfx.h CPP/7zip/Bundles/SFXWin/StdAfx.h
index f263ecb77c5..e96640e995c 100755
--- CPP/7zip/Bundles/SFXWin/StdAfx.h
+++ CPP/7zip/Bundles/SFXWin/StdAfx.h
@@ -6,7 +6,7 @@
 #include "../../../Common/Common.h"
 
 #include <commctrl.h>
-#include <ShlObj.h>
+#include <shlobj.h>
 
 // #define printf(x) NO_PRINTF_(x)
 // #define sprintf(x) NO_SPRINTF_(x)
diff --git CPP/7zip/Crypto/RandGen.cpp CPP/7zip/Crypto/RandGen.cpp
index c123109a15b..c3709ccff6b 100755
--- CPP/7zip/Crypto/RandGen.cpp
+++ CPP/7zip/Crypto/RandGen.cpp
@@ -19,7 +19,7 @@
 
 #ifdef USE_STATIC_RtlGenRandom
 
-// #include <NTSecAPI.h>
+// #include <ntsecapi.h>
 
 EXTERN_C_BEGIN
 #ifndef RtlGenRandom
diff --git CPP/7zip/GuiCommon.rc CPP/7zip/GuiCommon.rc
index 565ee702ef9..13043ef4c53 100755
--- CPP/7zip/GuiCommon.rc
+++ CPP/7zip/GuiCommon.rc
@@ -4,7 +4,7 @@
 // #include <WinUser.h>
 
 // for Windows CE:
-#include <CommCtrl.h>
+#include <commctrl.h>
 
 
 LANGUAGE LANG_ENGLISH, SUBLANG_ENGLISH_US
diff --git CPP/7zip/MyVersionInfo.rc CPP/7zip/MyVersionInfo.rc
index eddf8935c84..90e65376be8 100755
--- CPP/7zip/MyVersionInfo.rc
+++ CPP/7zip/MyVersionInfo.rc
@@ -1,2 +1,2 @@
 #include "MyVersion.h"
-#include "..\..\C\7zVersion.rc"
+#include "../../C/7zVersion.rc"
diff --git CPP/7zip/UI/Common/Update.cpp CPP/7zip/UI/Common/Update.cpp
index 5490ff445a0..003ee6634ea 100755
--- CPP/7zip/UI/Common/Update.cpp
+++ CPP/7zip/UI/Common/Update.cpp
@@ -1163,7 +1163,7 @@ static HRESULT EnumerateInArchiveItems(
 
 #if defined(_WIN32) && !defined(UNDER_CE)
 
-#include <MAPI.h>
+#include <mapi.h>
 
 #endif
 
diff --git CPP/7zip/UI/Console/Main.cpp CPP/7zip/UI/Console/Main.cpp
index 363572cd3dd..765f55293a7 100755
--- CPP/7zip/UI/Console/Main.cpp
+++ CPP/7zip/UI/Console/Main.cpp
@@ -5,7 +5,7 @@
 #include "../../../Common/MyWindows.h"
 
 #ifdef _WIN32
-#include <Psapi.h>
+#include <psapi.h>
 #else
 #include <unistd.h>
 #include <sys/ioctl.h>
diff --git CPP/7zip/UI/Explorer/ContextMenu.h CPP/7zip/UI/Explorer/ContextMenu.h
index e60ffccf11b..aea34e7de07 100755
--- CPP/7zip/UI/Explorer/ContextMenu.h
+++ CPP/7zip/UI/Explorer/ContextMenu.h
@@ -5,7 +5,7 @@
 
 #include "../../../Common/MyWindows.h"
 
-#include <ShlObj.h>
+#include <shlobj.h>
 
 #include "MyExplorerCommand.h"
 
diff --git CPP/7zip/UI/Explorer/DllExportsExplorer.cpp CPP/7zip/UI/Explorer/DllExportsExplorer.cpp
index 84c92e2e2d3..df126d8d232 100755
--- CPP/7zip/UI/Explorer/DllExportsExplorer.cpp
+++ CPP/7zip/UI/Explorer/DllExportsExplorer.cpp
@@ -11,7 +11,7 @@
 #include "../../../Common/MyWindows.h"
 // #include "../../../Common/IntToString.h"
 
-#include <OleCtl.h>
+#include <olectl.h>
 
 #include "../../../Common/MyInitGuid.h"
 
diff --git CPP/7zip/UI/Explorer/MyExplorerCommand.h CPP/7zip/UI/Explorer/MyExplorerCommand.h
index b1997f0da6e..d1d038df11b 100755
--- CPP/7zip/UI/Explorer/MyExplorerCommand.h
+++ CPP/7zip/UI/Explorer/MyExplorerCommand.h
@@ -17,7 +17,7 @@
     ShObjIdl.h      : old Windows SDK
     ShObjIdl_core.h : new Windows 10 SDK */
 
-#include <ShObjIdl.h>
+#include <shobjidl.h>
 
 #ifndef __IShellItem_INTERFACE_DEFINED__
 #define __IShellItem_INTERFACE_DEFINED__
diff --git CPP/7zip/UI/Explorer/StdAfx.h CPP/7zip/UI/Explorer/StdAfx.h
index 35e8b337d68..16883ceda1b 100755
--- CPP/7zip/UI/Explorer/StdAfx.h
+++ CPP/7zip/UI/Explorer/StdAfx.h
@@ -9,6 +9,6 @@
 
 #include "../../../Common/Common.h"
 
-#include <ShlObj.h>
+#include <shlobj.h>
 
 #endif
diff --git CPP/7zip/UI/FileManager/BrowseDialog.cpp CPP/7zip/UI/FileManager/BrowseDialog.cpp
index e43172385b6..286faeeb660 100755
--- CPP/7zip/UI/FileManager/BrowseDialog.cpp
+++ CPP/7zip/UI/FileManager/BrowseDialog.cpp
@@ -4,7 +4,7 @@
 
 #include "../../../Common/MyWindows.h"
 
-#include <CommCtrl.h>
+#include <commctrl.h>
 
 #ifndef UNDER_CE
 #include "../../../Windows/CommonDialog.h"
diff --git CPP/7zip/UI/FileManager/FM.cpp CPP/7zip/UI/FileManager/FM.cpp
index b0b3715c9a5..14af8c32288 100755
--- CPP/7zip/UI/FileManager/FM.cpp
+++ CPP/7zip/UI/FileManager/FM.cpp
@@ -4,7 +4,7 @@
 
 #include "../../../Common/MyWindows.h"
 
-#include <Shlwapi.h>
+#include <shlwapi.h>
 
 #include "../../../../C/Alloc.h"
 #ifdef _WIN32
diff --git CPP/7zip/UI/FileManager/FSFolderCopy.cpp CPP/7zip/UI/FileManager/FSFolderCopy.cpp
index b0e1146816d..16208e58f6b 100755
--- CPP/7zip/UI/FileManager/FSFolderCopy.cpp
+++ CPP/7zip/UI/FileManager/FSFolderCopy.cpp
@@ -4,7 +4,7 @@
 
 #include "../../../Common/MyWindows.h"
 
-#include <WinBase.h>
+#include <winbase.h>
 
 #include "../../../Common/Defs.h"
 #include "../../../Common/StringConvert.h"
diff --git CPP/7zip/UI/FileManager/HelpUtils.cpp CPP/7zip/UI/FileManager/HelpUtils.cpp
index 94253a70f5c..3f4479dbddd 100755
--- CPP/7zip/UI/FileManager/HelpUtils.cpp
+++ CPP/7zip/UI/FileManager/HelpUtils.cpp
@@ -24,7 +24,7 @@ void ShowHelpWindow(LPCSTR)
 #include "../../../Windows/FileName.h"
 
 #else
-#include <HtmlHelp.h>
+#include <htmlhelp.h>
 #endif
 
 #include "../../../Common/StringConvert.h"
diff --git CPP/7zip/UI/FileManager/MyWindowsNew.h CPP/7zip/UI/FileManager/MyWindowsNew.h
index c0fe8439b98..ba7d608b90e 100755
--- CPP/7zip/UI/FileManager/MyWindowsNew.h
+++ CPP/7zip/UI/FileManager/MyWindowsNew.h
@@ -5,7 +5,7 @@
 
 #ifdef _MSC_VER
 
-#include <ShObjIdl.h>
+#include <shobjidl.h>
 
 #ifndef __ITaskbarList3_INTERFACE_DEFINED__
 #define __ITaskbarList3_INTERFACE_DEFINED__
diff --git CPP/7zip/UI/FileManager/Panel.cpp CPP/7zip/UI/FileManager/Panel.cpp
index f7162e502ac..2eaf9e1266b 100755
--- CPP/7zip/UI/FileManager/Panel.cpp
+++ CPP/7zip/UI/FileManager/Panel.cpp
@@ -2,7 +2,7 @@
 
 #include "StdAfx.h"
 
-#include <WindowsX.h>
+#include <windowsx.h>
 // #include <stdio.h>
 
 #include "../../../Common/IntToString.h"
diff --git CPP/7zip/UI/FileManager/Panel.h CPP/7zip/UI/FileManager/Panel.h
index 5a9fef01de2..1f2b86a8e43 100755
--- CPP/7zip/UI/FileManager/Panel.h
+++ CPP/7zip/UI/FileManager/Panel.h
@@ -5,7 +5,7 @@
 
 #include "../../../Common/MyWindows.h"
 
-#include <ShlObj.h>
+#include <shlobj.h>
 
 #include "../../../../C/Alloc.h"
 
diff --git CPP/7zip/UI/FileManager/PanelItemOpen.cpp CPP/7zip/UI/FileManager/PanelItemOpen.cpp
index 6af42c96923..595acdbb563 100755
--- CPP/7zip/UI/FileManager/PanelItemOpen.cpp
+++ CPP/7zip/UI/FileManager/PanelItemOpen.cpp
@@ -4,7 +4,7 @@
 
 #include "../../../Common/MyWindows.h"
 
-#include <TlHelp32.h>
+#include <tlhelp32.h>
 
 #include "../../../Common/IntToString.h"
 
diff --git CPP/7zip/UI/FileManager/RootFolder.cpp CPP/7zip/UI/FileManager/RootFolder.cpp
index 6984434026f..d50c1eb832e 100755
--- CPP/7zip/UI/FileManager/RootFolder.cpp
+++ CPP/7zip/UI/FileManager/RootFolder.cpp
@@ -4,7 +4,7 @@
 
 #include "../../../Common/MyWindows.h"
 
-#include <ShlObj.h>
+#include <shlobj.h>
 
 #include "../../../Common/StringConvert.h"
 
diff --git CPP/7zip/UI/FileManager/StdAfx.h CPP/7zip/UI/FileManager/StdAfx.h
index 74cfbc6deef..88960aa8c58 100755
--- CPP/7zip/UI/FileManager/StdAfx.h
+++ CPP/7zip/UI/FileManager/StdAfx.h
@@ -14,8 +14,8 @@
 
 // #include "../../../Common/MyWindows.h"
 
-// #include <CommCtrl.h>
-// #include <ShlObj.h>
-// #include <Shlwapi.h>
+// #include <commctrl.h>
+// #include <shlobj.h>
+// #include <shlwapi.h>
 
 #endif
diff --git CPP/7zip/UI/FileManager/SysIconUtils.cpp CPP/7zip/UI/FileManager/SysIconUtils.cpp
index 43c613244a8..1cdf1d4c5b3 100755
--- CPP/7zip/UI/FileManager/SysIconUtils.cpp
+++ CPP/7zip/UI/FileManager/SysIconUtils.cpp
@@ -10,7 +10,7 @@
 
 #include "SysIconUtils.h"
 
-#include <ShlObj.h>
+#include <shlobj.h>
 
 #define MY_CAST_FUNC  (void(*)())
 // #define MY_CAST_FUNC
diff --git CPP/7zip/UI/FileManager/SysIconUtils.h CPP/7zip/UI/FileManager/SysIconUtils.h
index ba747d9ded0..2eedc4be403 100755
--- CPP/7zip/UI/FileManager/SysIconUtils.h
+++ CPP/7zip/UI/FileManager/SysIconUtils.h
@@ -5,7 +5,7 @@
 
 #include "../../../Common/MyWindows.h"
 
-#include <CommCtrl.h>
+#include <commctrl.h>
 
 #include "../../../Common/MyString.h"
 
diff --git CPP/7zip/UI/FileManager/SystemPage.cpp CPP/7zip/UI/FileManager/SystemPage.cpp
index ff68172e2bf..06025259c85 100755
--- CPP/7zip/UI/FileManager/SystemPage.cpp
+++ CPP/7zip/UI/FileManager/SystemPage.cpp
@@ -4,7 +4,7 @@
 
 #include "../../../Common/MyWindows.h"
 
-#include <ShlObj.h>
+#include <shlobj.h>
 
 #include "../../../Common/Defs.h"
 #include "../../../Common/StringConvert.h"
diff --git CPP/7zip/UI/GUI/GUI.cpp CPP/7zip/UI/GUI/GUI.cpp
index 0cc2ee3afcc..4ffc2384668 100755
--- CPP/7zip/UI/GUI/GUI.cpp
+++ CPP/7zip/UI/GUI/GUI.cpp
@@ -8,7 +8,7 @@
 
 #include "../../../Common/MyWindows.h"
 
-#include <Shlwapi.h>
+#include <shlwapi.h>
 
 #include "../../../Common/MyInitGuid.h"
 
diff --git CPP/7zip/UI/GUI/StdAfx.h CPP/7zip/UI/GUI/StdAfx.h
index 498b2fcbe4b..3c830f6a3d4 100755
--- CPP/7zip/UI/GUI/StdAfx.h
+++ CPP/7zip/UI/GUI/StdAfx.h
@@ -11,9 +11,9 @@
 
 // #include "../../../Common/MyWindows.h"
 
-// #include <CommCtrl.h>
-// #include <ShlObj.h>
-// #include <Shlwapi.h>
+// #include <commctrl.h>
+// #include <shlobj.h>
+// #include <shlwapi.h>
 
 // #define printf(x) NO_PRINTF_(x)
 // #define sprintf(x) NO_SPRINTF_(x)
diff --git CPP/Common/MyInitGuid.h CPP/Common/MyInitGuid.h
index 6895097371a..6b2f3f35d5a 100755
--- CPP/Common/MyInitGuid.h
+++ CPP/Common/MyInitGuid.h
@@ -29,7 +29,7 @@ Also we need IID_IUnknown that is initialized in some file for linking:
 #include <basetyps.h>
 #endif
 
-#include <InitGuid.h>
+#include <initguid.h>
 
 #ifdef UNDER_CE
 DEFINE_GUID(IID_IUnknown,
diff --git CPP/Common/MyWindows.h CPP/Common/MyWindows.h
index 69eed8f6446..f48680f9d05 100755
--- CPP/Common/MyWindows.h
+++ CPP/Common/MyWindows.h
@@ -5,7 +5,7 @@
 
 #ifdef _WIN32
 
-#include <Windows.h>
+#include <windows.h>
 
 #ifdef UNDER_CE
   #undef VARIANT_TRUE
diff --git CPP/Windows/Control/ComboBox.h CPP/Windows/Control/ComboBox.h
index 8ab9ce5027d..8b12599b785 100755
--- CPP/Windows/Control/ComboBox.h
+++ CPP/Windows/Control/ComboBox.h
@@ -5,7 +5,7 @@
 
 #include "../../Common/MyWindows.h"
 
-#include <CommCtrl.h>
+#include <commctrl.h>
 
 #include "../Window.h"
 
diff --git CPP/Windows/Control/ImageList.h CPP/Windows/Control/ImageList.h
index e59443058b8..f72ea0d1990 100755
--- CPP/Windows/Control/ImageList.h
+++ CPP/Windows/Control/ImageList.h
@@ -3,7 +3,7 @@
 #ifndef __WINDOWS_CONTROL_IMAGE_LIST_H
 #define __WINDOWS_CONTROL_IMAGE_LIST_H
 
-#include <CommCtrl.h>
+#include <commctrl.h>
 
 #include "../Defs.h"
 
diff --git CPP/Windows/Control/ListView.h CPP/Windows/Control/ListView.h
index 56e1100c726..cbd9cd1e21d 100755
--- CPP/Windows/Control/ListView.h
+++ CPP/Windows/Control/ListView.h
@@ -5,7 +5,7 @@
 
 #include "../../Common/MyWindows.h"
 
-#include <CommCtrl.h>
+#include <commctrl.h>
 
 #include "../Window.h"
 
diff --git CPP/Windows/Control/ProgressBar.h CPP/Windows/Control/ProgressBar.h
index 741315dd4dd..f18d89c14f0 100755
--- CPP/Windows/Control/ProgressBar.h
+++ CPP/Windows/Control/ProgressBar.h
@@ -5,7 +5,7 @@
 
 #include "../../Common/MyWindows.h"
 
-#include <CommCtrl.h>
+#include <commctrl.h>
 
 #include "../Window.h"
 
diff --git CPP/Windows/Control/PropertyPage.h CPP/Windows/Control/PropertyPage.h
index 97c87b3b453..551c95994c2 100755
--- CPP/Windows/Control/PropertyPage.h
+++ CPP/Windows/Control/PropertyPage.h
@@ -5,7 +5,7 @@
 
 #include "../../Common/MyWindows.h"
 
-#include <PrSht.h>
+#include <prsht.h>
 
 #include "Dialog.h"
 
diff --git CPP/Windows/FileIO.h CPP/Windows/FileIO.h
index 9146491d236..e11022f82d4 100755
--- CPP/Windows/FileIO.h
+++ CPP/Windows/FileIO.h
@@ -17,7 +17,7 @@
 #ifdef _WIN32
 
 #if defined(_WIN32) && !defined(UNDER_CE)
-#include <WinIoCtl.h>
+#include <winioctl.h>
 #endif
 
 #else
diff --git CPP/Windows/ProcessUtils.h CPP/Windows/ProcessUtils.h
index 64ebe3775e4..de46c6f52a5 100755
--- CPP/Windows/ProcessUtils.h
+++ CPP/Windows/ProcessUtils.h
@@ -3,7 +3,7 @@
 #ifndef __WINDOWS_PROCESS_UTILS_H
 #define __WINDOWS_PROCESS_UTILS_H
 
-#include <Psapi.h>
+#include <psapi.h>
 
 #include "../Common/MyString.h"
 
diff --git CPP/Windows/SecurityUtils.h CPP/Windows/SecurityUtils.h
index de62035ec86..18a083fc580 100755
--- CPP/Windows/SecurityUtils.h
+++ CPP/Windows/SecurityUtils.h
@@ -3,7 +3,7 @@
 #ifndef __WINDOWS_SECURITY_UTILS_H
 #define __WINDOWS_SECURITY_UTILS_H
 
-#include <NTSecAPI.h>
+#include <ntsecapi.h>
 
 #include "Defs.h"
 
diff --git CPP/Windows/Shell.h CPP/Windows/Shell.h
index 30388bc5a70..dc3daa5e60b 100755
--- CPP/Windows/Shell.h
+++ CPP/Windows/Shell.h
@@ -4,7 +4,7 @@
 #define __WINDOWS_SHELL_H
 
 #include "../Common/MyWindows.h"
-#include <ShlObj.h>
+#include <shlobj.h>
 
 #include "../Common/MyString.h"
 
