diff --git a/3rdparty/wepoll/wepoll.c b/3rdparty/wepoll/wepoll.c
index 651673aad37227314985327a42f6d94790fdb653..6b5e8c6ba1e6dad8d47983e7dfbeb91f913d0aac 100644
--- a/3rdparty/wepoll/wepoll.c
+++ b/3rdparty/wepoll/wepoll.c
@@ -136,9 +136,9 @@ WEPOLL_EXPORT int epoll_wait(HANDLE ephnd,
 #pragma warning(push, 1)
 #endif
 
-#include <WS2tcpip.h>
-#include <WinSock2.h>
-#include <Windows.h>
+#include <ws2tcpip.h>
+#include <winsock2.h>
+#include <windows.h>
 
 #ifndef __GNUC__
 #pragma warning(pop)
diff --git a/dap-sdk/core/include/dap_file_utils.h b/dap-sdk/core/include/dap_file_utils.h
index bc65301937c64d49859756056e66456b9e65cdc2..d729966872df42ca6ac729e62441f344d80e281c 100755
--- a/dap-sdk/core/include/dap_file_utils.h
+++ b/dap-sdk/core/include/dap_file_utils.h
@@ -30,7 +30,7 @@
 
 #ifdef _WIN32
 
-#include <Windows.h>
+#include <windows.h>
 
 /* On Win32, the canonical directory separator is the backslash, and
  * the search path separator is the semicolon. Note that also the
diff --git a/dap-sdk/core/test/rpmalloc/test/main.c b/dap-sdk/core/test/rpmalloc/test/main.c
index f8fccef20dfb68072c7381ba149226f7367be704..a6e13766263e3aa7992e36f4865b228ee37b1ead 100644
--- a/dap-sdk/core/test/rpmalloc/test/main.c
+++ b/dap-sdk/core/test/rpmalloc/test/main.c
@@ -805,7 +805,7 @@ main(int argc, char** argv) {
 #endif
 
 #ifdef _WIN32
-#include <Windows.h>
+#include <windows.h>
 
 static void
 test_initialize(void) {
diff --git a/dap-sdk/core/test/rpmalloc/test/thread.c b/dap-sdk/core/test/rpmalloc/test/thread.c
index 17b55035d1a54150db64cee553f516e9cf6f4850..21729f0c37b5e3dacdc8379605fe8147f74f922f 100644
--- a/dap-sdk/core/test/rpmalloc/test/thread.c
+++ b/dap-sdk/core/test/rpmalloc/test/thread.c
@@ -13,7 +13,7 @@
 #endif
 
 #ifdef _WIN32
-#  include <Windows.h>
+#  include <windows.h>
 #  include <process.h>
 
 static unsigned __stdcall
diff --git a/dap-sdk/core/test/rpmalloc/test/timer.c b/dap-sdk/core/test/rpmalloc/test/timer.c
index 2ceb4b7ec9689ef6fe5118015d33fdc1e860c262..db138712d08966ce9b7630a726cfc47c08ae107f 100644
--- a/dap-sdk/core/test/rpmalloc/test/timer.c
+++ b/dap-sdk/core/test/rpmalloc/test/timer.c
@@ -2,7 +2,7 @@
 #include <timer.h>
 
 #if defined(_WIN32)
-#  include <Windows.h>
+#  include <windows.h>
 #elif defined(__APPLE__)
 #  include <mach/mach_time.h>
 static mach_timebase_info_data_t _time_info;
diff --git a/dap-sdk/crypto/src/sig_picnic/picnic_impl.c b/dap-sdk/crypto/src/sig_picnic/picnic_impl.c
index a98e7fd85aad97e5ece7c90c64a9939c91fc5125..2a0e25ffe8d35f7479ed5b1a189514bfbad34f7d 100755
--- a/dap-sdk/crypto/src/sig_picnic/picnic_impl.c
+++ b/dap-sdk/crypto/src/sig_picnic/picnic_impl.c
@@ -18,7 +18,7 @@
 #include <string.h>
 #include <assert.h>
 #if defined (__WIN32)
-	#include <Windows.h>
+	#include <windows.h>
 	#include <bcrypt.h>
 #elif defined (__APPLE__)
     #include "macos_specific_endian.h"