diff --git a/LibCmo/CK2/CKFile.hpp b/LibCmo/CK2/CKFile.hpp
index 27b15e5..ddf10a2 100644
--- a/LibCmo/CK2/CKFile.hpp
+++ b/LibCmo/CK2/CKFile.hpp
@@ -172,7 +172,7 @@ namespace LibCmo::CK2 {
 		CKFileVisitor& operator=(const CKFileVisitor&);
 		CKFileVisitor& operator=(CKFileVisitor&&);
 
-		const CKFileObject* GetFileObjectByIndex(size_t index);
+		const CKFileObject* GetFileObjectByIndex(CKDWORD index);
 		CKDWORD GetIndexByObjectID(CK_ID objid);
 	protected:
 		bool m_IsReader;
diff --git a/LibCmo/CK2/CKFileOthers.cpp b/LibCmo/CK2/CKFileOthers.cpp
index 4385d8d..18a03cc 100644
--- a/LibCmo/CK2/CKFileOthers.cpp
+++ b/LibCmo/CK2/CKFileOthers.cpp
@@ -284,12 +284,12 @@ namespace LibCmo::CK2 {
 
 	CKFileVisitor::CKFileVisitor(CKFileReader* reader) :
 		m_IsReader(true), m_Reader(reader), m_Writer(nullptr), m_Ctx(reader->m_Ctx) {
-		if (reader == nullptr) LIBPANIC("Reader is nullptr.");
+		if (reader == nullptr) LIBCMO_PANIC("Reader is nullptr.");
 	}
 
 	CKFileVisitor::CKFileVisitor(CKFileWriter* writer) :
 		m_IsReader(false), m_Reader(nullptr), m_Writer(writer), m_Ctx(writer->m_Ctx) {
-		if (writer == nullptr) LIBPANIC("Writer is nullptr.");
+		if (writer == nullptr) LIBCMO_PANIC("Writer is nullptr.");
 	}
 
 	CKFileVisitor::CKFileVisitor(const CKFileVisitor& rhs) :
@@ -316,7 +316,7 @@ namespace LibCmo::CK2 {
 		return *this;
 	}
 
-	const CKFileObject* CKFileVisitor::GetFileObjectByIndex(size_t index) {
+	const CKFileObject* CKFileVisitor::GetFileObjectByIndex(CKDWORD index) {
 		if (m_IsReader) {
 			return &m_Reader->m_FileObjects[index];
 		} else {
diff --git a/LibCmo/CK2/CKGlobals.cpp b/LibCmo/CK2/CKGlobals.cpp
index 49da212..10f63cf 100644
--- a/LibCmo/CK2/CKGlobals.cpp
+++ b/LibCmo/CK2/CKGlobals.cpp
@@ -267,7 +267,7 @@ namespace LibCmo::CK2 {
 
 		// find direct parent
 		CKClassDesc& parent = g_CKClassInfo[static_cast<size_t>(desc.Parent)];
-		if (!parent.IsValid) LIBPANIC("No such CK_CLASSID.");
+		if (!parent.IsValid) LIBCMO_PANIC("No such CK_CLASSID.");
 
 		// if it is not self inheritance, call recursively
 		if (desc.Self != desc.Parent) {
@@ -291,7 +291,7 @@ namespace LibCmo::CK2 {
 		
 		// find direct parent
 		CKClassDesc& parent = g_CKClassInfo[static_cast<size_t>(desc.Parent)];
-		if (!parent.IsValid) LIBPANIC("No such CK_CLASSID.");
+		if (!parent.IsValid) LIBCMO_PANIC("No such CK_CLASSID.");
 
 		// if it is not self inheritance, call recursively
 		if (desc.Self != desc.Parent) {
diff --git a/LibCmo/CK2/CKStateChunkReader.cpp b/LibCmo/CK2/CKStateChunkReader.cpp
index b1d69a4..22fdf72 100644
--- a/LibCmo/CK2/CKStateChunkReader.cpp
+++ b/LibCmo/CK2/CKStateChunkReader.cpp
@@ -149,7 +149,7 @@ namespace LibCmo::CK2 {
 		if (id == nullptr) return false;
 
 		// get basic value
-		CKINT gotten_id = 0;
+		CKDWORD gotten_id = 0;
 		if (!this->ReadStruct(gotten_id)) return false;
 
 		// different strategy according to chunk ver
@@ -162,7 +162,7 @@ namespace LibCmo::CK2 {
 				return true;
 			}
 			// if it is positive, return corresponding value
-			if (gotten_id >= 0) {
+			if ((gotten_id & 0x80000000) == 0) {
 				*id = this->m_BindFile->GetFileObjectByIndex(gotten_id)->CreatedObjectId;
 				return true;
 			}
diff --git a/LibCmo/CK2/CKStateChunkWriter.cpp b/LibCmo/CK2/CKStateChunkWriter.cpp
index a2d85ec..b7e1a13 100644
--- a/LibCmo/CK2/CKStateChunkWriter.cpp
+++ b/LibCmo/CK2/CKStateChunkWriter.cpp
@@ -3,22 +3,6 @@
 #include "CKContext.hpp"
 #include "ObjImpls/CKObject.hpp"
 
-/*
-Memorandum:
-
-No need to write any data in m_ObjectList when writing Object ID.
-Because m_ObjectList only need to be written in when no bind CKFile
-according to IDA reversed code.
-However we assuem all CKStateChunk have bind file so no need to treat it.
-
-However, m_ManagerList should be filled when writing Manager Int.
-This is also instructed by IDA revsersed code.
-
-For m_ChunkList, it is same as m_ManagerList. We need write it.
-
-*/
-
-
 namespace LibCmo::CK2 {
 
 	void CKStateChunk::StartWrite() {
@@ -166,9 +150,21 @@ namespace LibCmo::CK2 {
 	}
 
 	bool CKStateChunk::WriteObjectID(const CK_ID* id) {
-		// MARK: if BindFile is not nullptr, no need to push this obj into obj list according to IDA code.
-		// but we assume BindFile always it not nullptr, so I remove that pushing code.
-		return this->WriteStruct(m_BindFile->GetIndexByObjectID(*id));
+		// if BindFile is not nullptr, 
+		// no need to push this obj into obj list according to IDA code.
+
+		if (m_BindFile != nullptr) {
+			this->WriteStruct(m_BindFile->GetIndexByObjectID(id != nullptr ? (*id) : 0));
+		} else {
+			if (id != nullptr) {
+				AddEntry(m_ObjectList, m_Parser.m_CurrentPos);
+				this->WriteStruct(id);
+			} else {
+				this->WriteStruct(static_cast<CKDWORD>(0));
+			}
+		}
+
+		return true;
 	}
 
 	bool CKStateChunk::WriteObjectPointer(ObjImpls::CKObject* obj) {
@@ -223,19 +219,25 @@ namespace LibCmo::CK2 {
 	bool CKStateChunk::WriteObjectIDSequence(const XContainer::XObjectArray* ls) {
 		if (ls == nullptr) return false;
 		
-		// MARK: there is a recording oper for object list when no bind file.
-		// but we always have bind file, so ignore it
+		// add current pos into manager list if no bind file
+		if (ls->size() != 0 && m_BindFile == nullptr) {
+			AddEntries(m_ObjectList, m_Parser.m_CurrentPos);
+		}
 
 		// write size first
 		CKDWORD objidsize = static_cast<CKDWORD>(ls->size());
 		if (!this->WriteStruct(objidsize)) return false;
 
-		// write each data
+		// write each item
 		for (auto objid : *ls) {
-			// MARK: originally we should not call WriteObjectID like ReadObjectIDSequence.
-			// because we do not write position data in obj list for each item.
-			// even if bind file always is not nullptr.
-			if (!this->WriteStruct(m_BindFile->GetIndexByObjectID(objid))) return false;
+			// because we do not want write position data in obj list for each item.
+			// so we do not call WriteObjectID here.
+			if (m_BindFile != nullptr) {
+				if (!this->WriteStruct(m_BindFile->GetIndexByObjectID(objid))) return false;
+			} else {
+				if (!this->WriteStruct(static_cast<CKDWORD>(objid))) return false;
+			}
+			
 		}
 
 		return true;
@@ -271,6 +273,7 @@ namespace LibCmo::CK2 {
 	bool CKStateChunk::WriteXObjectPointerArray(const XContainer::XObjectPointerArray* ls) {
 		if (ls == nullptr) return false;
 
+		// convert to id list and pass to id writer.
 		XContainer::XObjectArray conv;
 		for (auto obj : *ls) {
 			if (obj == nullptr) conv.emplace_back(0);
diff --git a/LibCmo/CK2/DataHandlers/CKBitmapHandler.cpp b/LibCmo/CK2/DataHandlers/CKBitmapHandler.cpp
index 0ca0eeb..ca8f222 100644
--- a/LibCmo/CK2/DataHandlers/CKBitmapHandler.cpp
+++ b/LibCmo/CK2/DataHandlers/CKBitmapHandler.cpp
@@ -1,4 +1,6 @@
 #include "CKBitmapHandler.hpp"
+#include "stb_image.h"
+#include "stb_image_write.h"
 
 namespace LibCmo::CK2::DataHandlers {
 
diff --git a/LibCmo/CK2/MgrImpls/CKPathManager.cpp b/LibCmo/CK2/MgrImpls/CKPathManager.cpp
index bef6e4a..5779c02 100644
--- a/LibCmo/CK2/MgrImpls/CKPathManager.cpp
+++ b/LibCmo/CK2/MgrImpls/CKPathManager.cpp
@@ -99,6 +99,14 @@ namespace LibCmo::CK2::MgrImpls {
 		return false;
 	}
 
+	void CKPathManager::GetFileName(XContainer::XString& u8path) {
+		std::filesystem::path filepath;
+		EncodingHelper::U8PathToStdPath(filepath, u8path.c_str());
+
+		auto result = filepath.filename();
+		EncodingHelper::StdPathToU8Path(u8path, result);
+	}
+
 	void CKPathManager::GetExtension(XContainer::XString& u8path) {
 		std::filesystem::path filepath;
 		EncodingHelper::U8PathToStdPath(filepath, u8path.c_str());
diff --git a/LibCmo/CK2/MgrImpls/CKPathManager.hpp b/LibCmo/CK2/MgrImpls/CKPathManager.hpp
index 91e68a3..0d43857 100644
--- a/LibCmo/CK2/MgrImpls/CKPathManager.hpp
+++ b/LibCmo/CK2/MgrImpls/CKPathManager.hpp
@@ -53,9 +53,15 @@ namespace LibCmo::CK2::MgrImpls {
 		*/
 		bool ResolveFileName(XContainer::XString& u8_filename);
 
+		/**
+		 * @brief Get file name part of given path.
+		 * @param u8path[inout] The given path. overwritten by the gotten file name.
+		*/
+		void GetFileName(XContainer::XString& u8path);
+
 		/**
 		 * @brief Returns the file extension including period (.)
-		 * @param u8path[inout] The given path. overwritten by the gotten extension. set to blank when failed.
+		 * @param u8path[inout] The given path. overwritten by the gotten extension.
 		*/
 		void GetExtension(XContainer::XString& u8path);
 
diff --git a/LibCmo/LibCmo.vcxproj b/LibCmo/LibCmo.vcxproj
index e0e8885..39810e2 100644
--- a/LibCmo/LibCmo.vcxproj
+++ b/LibCmo/LibCmo.vcxproj
@@ -228,7 +228,6 @@
     <ClInclude Include="VTAll.hpp" />
     <ClInclude Include="VTEncoding.hpp" />
     <ClInclude Include="CK2\ObjImpls\CKObject.hpp" />
-    <ClInclude Include="VTImage.hpp" />
     <ClInclude Include="VTUserAll.hpp" />
     <ClInclude Include="VTUtils.hpp" />
     <ClInclude Include="VxMath\VxEnums.hpp" />
diff --git a/LibCmo/LibCmo.vcxproj.filters b/LibCmo/LibCmo.vcxproj.filters
index bafe075..ab9c854 100644
--- a/LibCmo/LibCmo.vcxproj.filters
+++ b/LibCmo/LibCmo.vcxproj.filters
@@ -224,9 +224,6 @@
     <ClInclude Include="CK2\ObjImpls\CKMesh.hpp">
       <Filter>Headers\CK2\ObjImpls</Filter>
     </ClInclude>
-    <ClInclude Include="VTImage.hpp">
-      <Filter>Headers</Filter>
-    </ClInclude>
     <ClInclude Include="VTUserAll.hpp">
       <Filter>Headers</Filter>
     </ClInclude>
diff --git a/LibCmo/VTAll.hpp b/LibCmo/VTAll.hpp
index e90f346..cb5214a 100644
--- a/LibCmo/VTAll.hpp
+++ b/LibCmo/VTAll.hpp
@@ -38,10 +38,6 @@ Use native Win32 function in Windows.
 And use iconv under other OS.
 */
 #include "VTEncoding.hpp"
-/*
-System independent image loader / saver
-*/
-#include "VTImage.hpp"
 
 // Define the basic type of CK2.
 #include "CK2/CKTypes.hpp"
diff --git a/LibCmo/VTImage.hpp b/LibCmo/VTImage.hpp
deleted file mode 100644
index 087e442..0000000
--- a/LibCmo/VTImage.hpp
+++ /dev/null
@@ -1,7 +0,0 @@
-#pragma once
-
-// Bad wrapper for stb image library.
-
-#include "stb_image.h"
-#include "stb_image_write.h"
-#include "stb_image_resize.h"
diff --git a/LibCmo/VTUtils.cpp b/LibCmo/VTUtils.cpp
index ef69089..a979b6f 100644
--- a/LibCmo/VTUtils.cpp
+++ b/LibCmo/VTUtils.cpp
@@ -1,5 +1,16 @@
 #include "VTUtils.hpp"
 
+#if defined(LIBCMO_OS_WIN32)
+#include <intrin.h>
+// disable annoy macro at the same time
+#undef GetObject
+#undef GetClassName
+#undef LoadImage
+#undef GetTempPath
+#else
+#include <signal.h>
+#endif
+
 namespace LibCmo {
 
 	void LibPanic(int line, const char* file, const char* errmsg) {
@@ -8,4 +19,18 @@ namespace LibCmo {
 		std::abort();
 	}
 
+	void LibOrderDebugger() {
+#if defined(LIBCMO_BUILD_DEBUG)
+
+#if defined(LIBCMO_OS_WIN32)
+		// win32 debug break
+		__debugbreak();
+#else
+		// generic debug break
+		raise(SIGTRAP);
+#endif
+
+#endif
+	}
+
 }
diff --git a/LibCmo/VTUtils.hpp b/LibCmo/VTUtils.hpp
index 29526ba..1a34c02 100644
--- a/LibCmo/VTUtils.hpp
+++ b/LibCmo/VTUtils.hpp
@@ -77,7 +77,21 @@
 namespace LibCmo {
 
 	[[noreturn]] void LibPanic(int line, const char* file, const char* errmsg);
-#define LIBPANIC(msg) LibCmo::LibPanic(__LINE__, __FILE__, msg);
+#define LIBCMO_PANIC(msg) LibCmo::LibPanic(__LINE__, __FILE__, msg);
+
+	void LibOrderDebugger();
+#if defined(LIBCMO_BUILD_DEBUG)
+	/**
+	This macro only available in Debug mode.
+	It will order debugger stop.
+	This macro frequently used when program entering some rarely area.
+	For example, in CKStateChunk::ReadObjectID, if code run into the calling of Skip, it mean that this file is pretty old and debugger should notice it.
+	*/
+#define LIBCMO_ORDER_DEBUGGER LibOrderDebugger();
+#else
+	// define a blank one
+#define LIBCMO_ORDER_DEBUGGER
+#endif
 
 	namespace EnumsHelper {
 		
diff --git a/LibCmo/VxMath/VxMath.cpp b/LibCmo/VxMath/VxMath.cpp
index f1b45aa..d60f59f 100644
--- a/LibCmo/VxMath/VxMath.cpp
+++ b/LibCmo/VxMath/VxMath.cpp
@@ -1,5 +1,6 @@
-#include "../VTImage.hpp"
 #include "VxMath.hpp"
+#include "stb_image_resize.h"
+
 
 namespace LibCmo::VxMath {