diff --git a/README.md b/README.md
index d1937e9..bcf41d6 100644
--- a/README.md
+++ b/README.md
@@ -16,10 +16,9 @@
   - Import library for Windows DLL exports, e.g. `KERNEL32.dll!CreateProcessInternalW`, `ntdll.dll!LdrRegisterDllNotification`, ...
   - Addendum to Windows SDK
   - Extension macros and definitions, e.g. `NtCurrentPeb()`, `PEB(64/32)`, `TEB(64/32)`, ...
-- Specifications
-  - SMBIOS
-  - CPUID
-- Kits
+- Packages
+  - SMBIOS Specification
+  - CPUID Specification
   - Unit Test Framework
   - StrSafe.h (different from `strsafe.h` in Windows SDK)
 
@@ -41,18 +40,18 @@ NuGet package [KNSoft.NDK](https://www.nuget.org/packages/KNSoft.NDK) includes a
 The following features **are NOT enabled by default**, reference corresponding headers and libraries on demand:
 
 - Specifications
-  - CPUID: [CPUID.h](https://github.com/KNSoft/KNSoft.NDK/blob/main/Source/Include/KNSoft/NDK/Extension/CPUID.h)
-  - SMBIOS: [SMBIOS.h](https://github.com/KNSoft/KNSoft.NDK/blob/main/Source/Include/KNSoft/NDK/Extension/SMBIOS.h)
+  - CPUID: [CPUID.h](https://github.com/KNSoft/KNSoft.NDK/blob/main/Source/Include/KNSoft/NDK/Package/CPUID.h)
+  - SMBIOS: [SMBIOS.h](https://github.com/KNSoft/KNSoft.NDK/blob/main/Source/Include/KNSoft/NDK/Package/SMBIOS.h)
 - Ntdll Hash API (`(A_SHA/MD4/MD5)(Init/Update/Final)`)
   - [Ntdll.Hash.h](https://github.com/KNSoft/KNSoft.NDK/blob/main/Source/Include/KNSoft/NDK/Win32/API/Ntdll.Hash.h)
   - KNSoft.NDK.Ntdll.Hash.lib (Generated from [KNSoft.NDK.Ntdll.Hash.xml](https://github.com/KNSoft/KNSoft.NDK/blob/main/Source/KNSoft.NDK/WinAPI/KNSoft.NDK.Ntdll.Hash.xml))
 - Windows API import library addendum
   - KNSoft.NDK.WinAPI.lib (Generated from [KNSoft.NDK.WinAPI.xml](https://github.com/KNSoft/KNSoft.NDK/blob/main/Source/KNSoft.NDK/WinAPI/KNSoft.NDK.WinAPI.xml))
 - Unit Test Framework
-  - [UnitTest.h](https://github.com/KNSoft/KNSoft.NDK/blob/main/Source/Include/KNSoft/NDK/UnitTest/UnitTest.h)
-  - [UnitTest.inl](https://github.com/KNSoft/KNSoft.NDK/blob/main/Source/Include/KNSoft/NDK/UnitTest/UnitTest.inl)
+  - [UnitTest.h](https://github.com/KNSoft/KNSoft.NDK/blob/main/Source/Include/KNSoft/NDK/Package/UnitTest.h)
+  - [UnitTest.inl](https://github.com/KNSoft/KNSoft.NDK/blob/main/Source/Include/KNSoft/NDK/Package/UnitTest.inl)
 - Safe string functions (different from `strsafe.h` in Windows SDK)
-  - [StrSafe.h](https://github.com/KNSoft/KNSoft.NDK/blob/main/Source/Include/KNSoft/NDK/Extension/StrSafe.h)
+  - [StrSafe.h](https://github.com/KNSoft/KNSoft.NDK/blob/main/Source/Include/KNSoft/NDK/Package/StrSafe.h)
 
 The following features **are enabled by default**, can be excluded by defining corresponding macro:
 
diff --git a/README.zh-CN.md b/README.zh-CN.md
index 2617626..86c2b06 100644
--- a/README.zh-CN.md
+++ b/README.zh-CN.md
@@ -16,10 +16,9 @@
   - Windows DLL导出项引入库，例如：`KERNEL32.dll!CreateProcessInternalW`、`ntdll.dll!LdrRegisterDllNotification`……
   - Windows SDK的补充
   - 扩展的宏和定义，例如：`NtCurrentPeb()`、`PEB(64/32)`、`TEB(64/32)`……
-- 规范
-  - SMBIOS
-  - CPUID
-- 工具
+- 包
+  - SMBIOS规范
+  - CPUID规范
   - 单元测试框架
   - StrSafe.h（与Windows SDK里的`strsafe.h`不同）
 
@@ -41,18 +40,18 @@ NuGet包[KNSoft.NDK](https://www.nuget.org/packages/KNSoft.NDK)包含所有头
 下列功能**默认没有启用**，按需引用对应的头文件和库：
 
 - 规范
-  - CPUID: [CPUID.h](https://github.com/KNSoft/KNSoft.NDK/blob/main/Source/Include/KNSoft/NDK/Extension/CPUID.h)
-  - SMBIOS: [SMBIOS.h](https://github.com/KNSoft/KNSoft.NDK/blob/main/Source/Include/KNSoft/NDK/Extension/SMBIOS.h)
+  - CPUID: [CPUID.h](https://github.com/KNSoft/KNSoft.NDK/blob/main/Source/Include/KNSoft/NDK/Package/CPUID.h)
+  - SMBIOS: [SMBIOS.h](https://github.com/KNSoft/KNSoft.NDK/blob/main/Source/Include/KNSoft/NDK/Package/SMBIOS.h)
 - Ntdll Hash API (`(A_SHA/MD4/MD5)(Init/Update/Final)`)
   - [Ntdll.Hash.h](https://github.com/KNSoft/KNSoft.NDK/blob/main/Source/Include/KNSoft/NDK/Win32/API/Ntdll.Hash.h)
   - KNSoft.NDK.Ntdll.Hash.lib (由[KNSoft.NDK.Ntdll.Hash.xml](https://github.com/KNSoft/KNSoft.NDK/blob/main/Source/KNSoft.NDK/WinAPI/KNSoft.NDK.Ntdll.Hash.xml)生成)
 - Windows API 引入库补充
   - KNSoft.NDK.WinAPI.lib (由[KNSoft.NDK.WinAPI.xml](https://github.com/KNSoft/KNSoft.NDK/blob/main/Source/KNSoft.NDK/WinAPI/KNSoft.NDK.WinAPI.xml)生成)
 - 单元测试框架
-  - [UnitTest.h](https://github.com/KNSoft/KNSoft.NDK/blob/main/Source/Include/KNSoft/NDK/UnitTest/UnitTest.h)
-  - [UnitTest.inl](https://github.com/KNSoft/KNSoft.NDK/blob/main/Source/Include/KNSoft/NDK/UnitTest/UnitTest.inl)
+  - [UnitTest.h](https://github.com/KNSoft/KNSoft.NDK/blob/main/Source/Include/KNSoft/NDK/Package/UnitTest.h)
+  - [UnitTest.inl](https://github.com/KNSoft/KNSoft.NDK/blob/main/Source/Include/KNSoft/NDK/Package/UnitTest.inl)
 - 安全字符串函数（与Windows SDK里的`strsafe.h`不同）
-  - [StrSafe.h](https://github.com/KNSoft/KNSoft.NDK/blob/main/Source/Include/KNSoft/NDK/Extension/StrSafe.h)
+  - [StrSafe.h](https://github.com/KNSoft/KNSoft.NDK/blob/main/Source/Include/KNSoft/NDK/Package/StrSafe.h)
 
 下列功能**默认启用**，定义对应宏可进行排除：
 
diff --git a/Source/Include/KNSoft/NDK/NDK.h b/Source/Include/KNSoft/NDK/NDK.h
index 3684883..8d0b6f3 100644
--- a/Source/Include/KNSoft/NDK/NDK.h
+++ b/Source/Include/KNSoft/NDK/NDK.h
@@ -31,5 +31,5 @@
 /* Enable extensions */
 
 #ifndef _KNSOFT_NDK_NO_EXTENSION
-#include "Extension/Extension.h"
+#include "Package/Extension.h"
 #endif
diff --git a/Source/Include/KNSoft/NDK/NT/Extension/Security.h b/Source/Include/KNSoft/NDK/NT/Extension/Security.h
index 6fe7b64..afd43f4 100644
--- a/Source/Include/KNSoft/NDK/NT/Extension/Security.h
+++ b/Source/Include/KNSoft/NDK/NT/Extension/Security.h
@@ -1,7 +1,7 @@
 #pragma once
 
 #include "../MinDef.h"
-#include "../../Extension/Extension.h"
+#include "../../Package/Extension.h"
 
 /* Well-known SIDs */
 
diff --git a/Source/Include/KNSoft/NDK/Extension/CPUID.h b/Source/Include/KNSoft/NDK/Package/CPUID.h
similarity index 97%
rename from Source/Include/KNSoft/NDK/Extension/CPUID.h
rename to Source/Include/KNSoft/NDK/Package/CPUID.h
index d46fd36..527c83a 100644
--- a/Source/Include/KNSoft/NDK/Extension/CPUID.h
+++ b/Source/Include/KNSoft/NDK/Package/CPUID.h
@@ -1,4 +1,11 @@
-#pragma once
+/*
+ * KNSoft.NDK CPUID.h package, licensed under the MIT license.
+ * Copyright (c) KNSoft.org (https://github.com/KNSoft). All rights reserved.
+ *
+ * Intel CPUID Specification.
+ */
+
+#pragma once
 
 #define CPUID_INTEL_VERSION_INFO_MASK 0xFFF3FF0 // Extended Family ID | Extended Model ID | Processor Type | Family ID | Model
 #define CPUID_MAKE_INTEL_VERSION_INFO(ExtendedFamilyId, ExtendedModelId, ProcessorType, FamilyId, Model, SteppingId)\
diff --git a/Source/Include/KNSoft/NDK/Extension/Extension.h b/Source/Include/KNSoft/NDK/Package/Extension.h
similarity index 94%
rename from Source/Include/KNSoft/NDK/Extension/Extension.h
rename to Source/Include/KNSoft/NDK/Package/Extension.h
index c1bb7c4..221f237 100644
--- a/Source/Include/KNSoft/NDK/Extension/Extension.h
+++ b/Source/Include/KNSoft/NDK/Package/Extension.h
@@ -1,4 +1,6 @@
-#pragma once
+/* KNSoft.NDK extension package, native addendum */
+
+#pragma once
 
 #ifdef _KNSOFT_NDK_NO_EXTENSION
 #pragma message("KNSoft.NDK: Extension.h is included but _KNSOFT_NDK_NO_EXTENSION is defined.")
diff --git a/Source/Include/KNSoft/NDK/Extension/SMBIOS.h b/Source/Include/KNSoft/NDK/Package/SMBIOS.h
similarity index 97%
rename from Source/Include/KNSoft/NDK/Extension/SMBIOS.h
rename to Source/Include/KNSoft/NDK/Package/SMBIOS.h
index 23d0018..5dc40a9 100644
--- a/Source/Include/KNSoft/NDK/Extension/SMBIOS.h
+++ b/Source/Include/KNSoft/NDK/Package/SMBIOS.h
@@ -1,5 +1,6 @@
 /*
- * KNSoft.NDK SMBIOS.h licensed under the MIT license.
+ * KNSoft.NDK SMBIOS.h package, licensed under the MIT license.
+ * Copyright (c) KNSoft.org (https://github.com/KNSoft). All rights reserved.
  *
  * SMBIOS Specification (https://www.dmtf.org/standards/smbios)
  *
diff --git a/Source/Include/KNSoft/NDK/Extension/StrSafe.h b/Source/Include/KNSoft/NDK/Package/StrSafe.h
similarity index 92%
rename from Source/Include/KNSoft/NDK/Extension/StrSafe.h
rename to Source/Include/KNSoft/NDK/Package/StrSafe.h
index d8378cd..93e29b1 100644
--- a/Source/Include/KNSoft/NDK/Extension/StrSafe.h
+++ b/Source/Include/KNSoft/NDK/Package/StrSafe.h
@@ -1,5 +1,6 @@
 /*
- * KNSoft.NDK StrSafe.h licensed under the MIT license.
+ * KNSoft.NDK StrSafe.h package, licensed under the MIT license.
+ * Copyright (c) KNSoft.org (https://github.com/KNSoft). All rights reserved.
  *
  * Make C string routines a bit more safe and easy.
  * Not equals to the strsafe.h in Windows SDK.
diff --git a/Source/Include/KNSoft/NDK/UnitTest/UnitTest.h b/Source/Include/KNSoft/NDK/Package/UnitTest.h
similarity index 93%
rename from Source/Include/KNSoft/NDK/UnitTest/UnitTest.h
rename to Source/Include/KNSoft/NDK/Package/UnitTest.h
index e6a4243..67374ee 100644
--- a/Source/Include/KNSoft/NDK/UnitTest/UnitTest.h
+++ b/Source/Include/KNSoft/NDK/Package/UnitTest.h
@@ -1,7 +1,8 @@
 /*
- * KNSoft.NDK.UnitTest - Lite weight unit test framework
+ * KNSoft.NDK UnitTest.h package, licensed under the MIT license.
  * Copyright (c) KNSoft.org (https://github.com/KNSoft). All rights reserved.
- * Licensed under the MIT license.
+ * 
+ * Lite weight unit test framework.
  */
 
 #pragma once
diff --git a/Source/Include/KNSoft/NDK/UnitTest/UnitTest.inl b/Source/Include/KNSoft/NDK/Package/UnitTest.inl
similarity index 95%
rename from Source/Include/KNSoft/NDK/UnitTest/UnitTest.inl
rename to Source/Include/KNSoft/NDK/Package/UnitTest.inl
index 12e83ce..0b2b776 100644
--- a/Source/Include/KNSoft/NDK/UnitTest/UnitTest.inl
+++ b/Source/Include/KNSoft/NDK/Package/UnitTest.inl
@@ -1,9 +1,9 @@
 #pragma once
 
-#include "./UnitTest.h"
+#include "UnitTest.h"
 
 #include "../NT/NT.h"
-#include "../Extension/StrSafe.h"
+#include "StrSafe.h"
 
 #pragma region Prints
 
diff --git a/Source/KNSoft.NDK/KNSoft.NDK.vcxproj b/Source/KNSoft.NDK/KNSoft.NDK.vcxproj
index 5bf4bee..d2c4202 100644
--- a/Source/KNSoft.NDK/KNSoft.NDK.vcxproj
+++ b/Source/KNSoft.NDK/KNSoft.NDK.vcxproj
@@ -118,10 +118,6 @@
     </Link>
   </ItemDefinitionGroup>
   <ItemGroup>
-    <ClInclude Include="..\Include\KNSoft\NDK\Extension\CPUID.h" />
-    <ClInclude Include="..\Include\KNSoft\NDK\Extension\Extension.h" />
-    <ClInclude Include="..\Include\KNSoft\NDK\Extension\SMBIOS.h" />
-    <ClInclude Include="..\Include\KNSoft\NDK\Extension\StrSafe.h" />
     <ClInclude Include="..\Include\KNSoft\NDK\NT\Bcd.h" />
     <ClInclude Include="..\Include\KNSoft\NDK\NT\Cm\Cm.h" />
     <ClInclude Include="..\Include\KNSoft\NDK\NT\Cm\Reg.h" />
@@ -234,7 +230,11 @@
     <ClInclude Include="..\Include\KNSoft\NDK\NT\Wow\Wow.h" />
     <ClInclude Include="..\Include\KNSoft\NDK\NT\Wow\WowApi.h" />
     <ClInclude Include="..\Include\KNSoft\NDK\NT\ZwApi.h" />
-    <ClInclude Include="..\Include\KNSoft\NDK\UnitTest\UnitTest.h" />
+    <ClInclude Include="..\Include\KNSoft\NDK\Package\CPUID.h" />
+    <ClInclude Include="..\Include\KNSoft\NDK\Package\Extension.h" />
+    <ClInclude Include="..\Include\KNSoft\NDK\Package\SMBIOS.h" />
+    <ClInclude Include="..\Include\KNSoft\NDK\Package\StrSafe.h" />
+    <ClInclude Include="..\Include\KNSoft\NDK\Package\UnitTest.h" />
     <ClInclude Include="..\Include\KNSoft\NDK\Win32\API\Kernel32.h" />
     <ClInclude Include="..\Include\KNSoft\NDK\Win32\API\Ntdll.h" />
     <ClInclude Include="..\Include\KNSoft\NDK\Win32\API\Ntdll.Hash.h" />
@@ -247,7 +247,7 @@
     <ClInclude Include="..\Include\KNSoft\NDK\NDK.h" />
   </ItemGroup>
   <ItemGroup>
-    <None Include="..\Include\KNSoft\NDK\UnitTest\UnitTest.inl" />
+    <None Include="..\Include\KNSoft\NDK\Package\UnitTest.inl" />
     <None Include="packages.config" />
   </ItemGroup>
   <ItemGroup>
diff --git a/Source/KNSoft.NDK/KNSoft.NDK.vcxproj.filters b/Source/KNSoft.NDK/KNSoft.NDK.vcxproj.filters
index 0041221..82a83ca 100644
--- a/Source/KNSoft.NDK/KNSoft.NDK.vcxproj.filters
+++ b/Source/KNSoft.NDK/KNSoft.NDK.vcxproj.filters
@@ -1,9 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <ItemGroup>
-    <Filter Include="Extension">
-      <UniqueIdentifier>{0824e6bd-fba8-4ba1-a245-1c0743fc1404}</UniqueIdentifier>
-    </Filter>
     <Filter Include="NT">
       <UniqueIdentifier>{3769bb18-ab05-4c44-8684-2ff9124963ae}</UniqueIdentifier>
     </Filter>
@@ -16,9 +13,6 @@
     <Filter Include="Win32\API">
       <UniqueIdentifier>{b8cf96b3-56aa-4366-920a-77b5f9d68ee9}</UniqueIdentifier>
     </Filter>
-    <Filter Include="UnitTest">
-      <UniqueIdentifier>{a8b5d84e-895c-4b3c-843e-85298108c298}</UniqueIdentifier>
-    </Filter>
     <Filter Include="NT\Rtl">
       <UniqueIdentifier>{a68ed197-518e-4f67-a03c-8742d02e2142}</UniqueIdentifier>
     </Filter>
@@ -70,6 +64,9 @@
     <Filter Include="NT\Lpc">
       <UniqueIdentifier>{958aa1bb-cdb8-44d9-9071-55c0cf230408}</UniqueIdentifier>
     </Filter>
+    <Filter Include="Package">
+      <UniqueIdentifier>{a566dc55-3916-4927-ae91-86f02a7a5529}</UniqueIdentifier>
+    </Filter>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="..\Include\KNSoft\NDK\NDK.h" />
@@ -79,18 +76,6 @@
     <ClInclude Include="..\Include\KNSoft\NDK\NT\NT.h">
       <Filter>NT</Filter>
     </ClInclude>
-    <ClInclude Include="..\Include\KNSoft\NDK\Extension\CPUID.h">
-      <Filter>Extension</Filter>
-    </ClInclude>
-    <ClInclude Include="..\Include\KNSoft\NDK\Extension\Extension.h">
-      <Filter>Extension</Filter>
-    </ClInclude>
-    <ClInclude Include="..\Include\KNSoft\NDK\Extension\SMBIOS.h">
-      <Filter>Extension</Filter>
-    </ClInclude>
-    <ClInclude Include="..\Include\KNSoft\NDK\Extension\StrSafe.h">
-      <Filter>Extension</Filter>
-    </ClInclude>
     <ClInclude Include="..\Include\KNSoft\NDK\Win32\Def\CommCtrl.h">
       <Filter>Win32\Def</Filter>
     </ClInclude>
@@ -109,9 +94,6 @@
     <ClInclude Include="..\Include\KNSoft\NDK\Win32\API\User32.h">
       <Filter>Win32\API</Filter>
     </ClInclude>
-    <ClInclude Include="..\Include\KNSoft\NDK\UnitTest\UnitTest.h">
-      <Filter>UnitTest</Filter>
-    </ClInclude>
     <ClInclude Include="..\Include\KNSoft\NDK\NT\Rtl\Memory.h">
       <Filter>NT\Rtl</Filter>
     </ClInclude>
@@ -451,11 +433,26 @@
     <ClInclude Include="..\Include\KNSoft\NDK\NT\Win32K\Misc.h">
       <Filter>NT\Win32K</Filter>
     </ClInclude>
+    <ClInclude Include="..\Include\KNSoft\NDK\Package\CPUID.h">
+      <Filter>Package</Filter>
+    </ClInclude>
+    <ClInclude Include="..\Include\KNSoft\NDK\Package\Extension.h">
+      <Filter>Package</Filter>
+    </ClInclude>
+    <ClInclude Include="..\Include\KNSoft\NDK\Package\SMBIOS.h">
+      <Filter>Package</Filter>
+    </ClInclude>
+    <ClInclude Include="..\Include\KNSoft\NDK\Package\StrSafe.h">
+      <Filter>Package</Filter>
+    </ClInclude>
+    <ClInclude Include="..\Include\KNSoft\NDK\Package\UnitTest.h">
+      <Filter>Package</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <None Include="packages.config" />
-    <None Include="..\Include\KNSoft\NDK\UnitTest\UnitTest.inl">
-      <Filter>UnitTest</Filter>
+    <None Include="..\Include\KNSoft\NDK\Package\UnitTest.inl">
+      <Filter>Package</Filter>
     </None>
   </ItemGroup>
   <ItemGroup>
diff --git a/Source/Test/Main.c b/Source/Test/Main.c
index 596cee2..103e9b9 100644
--- a/Source/Test/Main.c
+++ b/Source/Test/Main.c
@@ -1,5 +1,5 @@
 #include <KNSoft/NDK/NDK.h>
-#include <KNSoft/NDK/UnitTest/UnitTest.inl>
+#include <KNSoft/NDK/Package/UnitTest.inl>
 
 TEST_DECL_FUNC(UnitTestFramework);
 TEST_DECL_FUNC(MSToolChain);
diff --git a/Source/Test/StrSafe.c b/Source/Test/StrSafe.c
index d60f865..d318184 100644
--- a/Source/Test/StrSafe.c
+++ b/Source/Test/StrSafe.c
@@ -4,7 +4,7 @@
 
 #include "Test.h"
 
-#include <KNSoft/NDK/Extension/StrSafe.h>
+#include <KNSoft/NDK/Package/StrSafe.h>
 
 #define DEFINE_TEST_STRING(Name, String)\
 static const char Name##_A[] = String;\
diff --git a/Source/Test/Test.h b/Source/Test/Test.h
index a4aefaa..bdeede6 100644
--- a/Source/Test/Test.h
+++ b/Source/Test/Test.h
@@ -1,7 +1,7 @@
 #pragma once
 
 #include <KNSoft/NDK/NDK.h>
-#include <KNSoft/NDK/UnitTest/UnitTest.h>
+#include <KNSoft/NDK/Package/UnitTest.h>
 #include <KNSoft/NDK/Win32/API/Ntdll.Hash.h>
 
 #pragma comment(lib, "KNSoft.NDK.Ntdll.Hash.lib")