diff --git a/api/include/opentelemetry/plugin/detail/dynamic_load_windows.h b/api/include/opentelemetry/plugin/detail/dynamic_load_windows.h
index 5ed2833756..7f4365e3c8 100644
--- a/api/include/opentelemetry/plugin/detail/dynamic_load_windows.h
+++ b/api/include/opentelemetry/plugin/detail/dynamic_load_windows.h
@@ -12,10 +12,10 @@
 #include "opentelemetry/plugin/hook.h"
 #include "opentelemetry/version.h"
 
-#include <Windows.h>
+#include <windows.h>
 
-#include <WinBase.h>
 #include <errhandlingapi.h>
+#include <winbase.h>
 
 OPENTELEMETRY_BEGIN_NAMESPACE
 namespace plugin
diff --git a/exporters/etw/include/opentelemetry/exporters/etw/etw_properties.h b/exporters/etw/include/opentelemetry/exporters/etw/etw_properties.h
index 3a14780d8c..acc888c8b2 100644
--- a/exporters/etw/include/opentelemetry/exporters/etw/etw_properties.h
+++ b/exporters/etw/include/opentelemetry/exporters/etw/etw_properties.h
@@ -13,7 +13,7 @@
 #include <vector>
 
 #ifdef _WIN32
-#  include <Windows.h>
+#  include <windows.h>
 #endif
 
 OPENTELEMETRY_BEGIN_NAMESPACE
diff --git a/exporters/etw/include/opentelemetry/exporters/etw/etw_provider.h b/exporters/etw/include/opentelemetry/exporters/etw/etw_provider.h
index 7dc2bad0ff..ddda56bb5d 100644
--- a/exporters/etw/include/opentelemetry/exporters/etw/etw_provider.h
+++ b/exporters/etw/include/opentelemetry/exporters/etw/etw_provider.h
@@ -42,7 +42,7 @@
 #include <vector>
 
 #ifdef HAVE_KRABS_TESTS
-// krabs.hpp requires this definition of min macro from Windows.h
+// krabs.hpp requires this definition of min macro from windows.h
 #  ifndef min
 #    define min(a, b) (((a) < (b)) ? (a) : (b))
 #  endif
diff --git a/exporters/etw/include/opentelemetry/exporters/etw/etw_random_id_generator.h b/exporters/etw/include/opentelemetry/exporters/etw/etw_random_id_generator.h
index aa23e6f81b..d0b050fcc7 100644
--- a/exporters/etw/include/opentelemetry/exporters/etw/etw_random_id_generator.h
+++ b/exporters/etw/include/opentelemetry/exporters/etw/etw_random_id_generator.h
@@ -6,7 +6,7 @@
 #include "opentelemetry/version.h"
 
 #ifdef _WIN32
-#  include "Windows.h"
+#  include "windows.h"
 #endif
 
 OPENTELEMETRY_BEGIN_NAMESPACE
diff --git a/exporters/etw/include/opentelemetry/exporters/etw/utils.h b/exporters/etw/include/opentelemetry/exporters/etw/utils.h
index f3665efc80..a59338147e 100644
--- a/exporters/etw/include/opentelemetry/exporters/etw/utils.h
+++ b/exporters/etw/include/opentelemetry/exporters/etw/utils.h
@@ -17,12 +17,12 @@
 #include "opentelemetry/version.h"
 
 #ifdef _WIN32
-#  include <Windows.h>
 #  include <evntprov.h>
 #  include <wincrypt.h>
+#  include <windows.h>
 #  pragma comment(lib, "Advapi32.lib")
 #  pragma comment(lib, "Rpcrt4.lib")
-#  include <Objbase.h>
+#  include <objbase.h>
 #  pragma comment(lib, "Ole32.Lib")
 #else
 #  include <codecvt>
diff --git a/exporters/etw/include/opentelemetry/exporters/etw/uuid.h b/exporters/etw/include/opentelemetry/exporters/etw/uuid.h
index dfe749d831..243432f82f 100644
--- a/exporters/etw/include/opentelemetry/exporters/etw/uuid.h
+++ b/exporters/etw/include/opentelemetry/exporters/etw/uuid.h
@@ -13,7 +13,7 @@
 #include <vector>
 
 #ifdef _WIN32
-#  include "Windows.h"
+#  include "windows.h"
 #endif
 
 OPENTELEMETRY_BEGIN_NAMESPACE
diff --git a/exporters/otlp/src/otlp_file_client.cc b/exporters/otlp/src/otlp_file_client.cc
index 021035eb55..c1c00cd01d 100644
--- a/exporters/otlp/src/otlp_file_client.cc
+++ b/exporters/otlp/src/otlp_file_client.cc
@@ -43,9 +43,9 @@
 #    define NOMINMAX
 #  endif
 
-#  include <Windows.h>
 #  include <direct.h>
 #  include <io.h>
+#  include <windows.h>
 
 #  ifdef UNICODE
 #    include <atlconv.h>
diff --git a/ext/include/opentelemetry/ext/http/server/socket_tools.h b/ext/include/opentelemetry/ext/http/server/socket_tools.h
index 317d08e847..6a568eef94 100644
--- a/ext/include/opentelemetry/ext/http/server/socket_tools.h
+++ b/ext/include/opentelemetry/ext/http/server/socket_tools.h
@@ -16,7 +16,7 @@
 
 #ifdef _WIN32
 
-// #  include <Windows.h>
+// #  include <windows.h>
 
 #  include <winsock2.h>
 
diff --git a/sdk/src/common/fast_random_number_generator.h b/sdk/src/common/fast_random_number_generator.h
index 13e6c738d1..66c9c06b63 100644
--- a/sdk/src/common/fast_random_number_generator.h
+++ b/sdk/src/common/fast_random_number_generator.h
@@ -25,7 +25,7 @@ namespace common
  *
  * ...
  * #define NOMINMAX
- * #include <Windows.h>
+ * #include <windows.h>
  * ...
  *
  * See: