diff --git a/BMap/BMExports.cpp b/BMap/BMExports.cpp
index 347e04f..c0e181b 100644
--- a/BMap/BMExports.cpp
+++ b/BMap/BMExports.cpp
@@ -22,3 +22,42 @@ void BMDispose() {
 	// unregister iron pad
 	IronPad::IronPadUnregister();
 }
+
+BMap::BMFile* BMFile_Load(LibCmo::CKSTRING file_name, LibCmo::CKSTRING temp_folder, LibCmo::CKSTRING texture_folder, LibCmo::CKDWORD encoding_count, LibCmo::CKSTRING encodings[]) {
+	auto file = new BMap::BMFile(temp_folder, texture_folder, encoding_count, encodings, false);
+	if (file->IsFailed()) {
+		delete file;
+		file = nullptr;
+	}
+	if (!file->Load(file_name)) {
+		delete file;
+		file = nullptr;
+	}
+
+	g_AllBMFiles.emplace(file);
+	return file;
+}
+
+BMap::BMFile* BMFile_Create(LibCmo::CKSTRING temp_folder, LibCmo::CKSTRING texture_folder, LibCmo::CKDWORD encoding_count, LibCmo::CKSTRING encodings[]) {
+	auto file = new BMap::BMFile(temp_folder, texture_folder, encoding_count, encodings, false);
+	if (file->IsFailed()) {
+		delete file;
+		file = nullptr;
+	}
+
+	g_AllBMFiles.emplace(file);
+	return file;
+}
+
+bool BMFile_Save(BMap::BMFile* map_file, LibCmo::CKSTRING file_name, LibCmo::CKINT compreess_level) {
+	if (!g_AllBMFiles.contains(map_file)) return false;
+	return map_file->Save(file_name, compreess_level);
+}
+
+void BMFile_Free(BMap::BMFile* map_file) {
+	// only free correct pointer
+	if (map_file == nullptr) return;
+	if (g_AllBMFiles.erase(map_file) != 0) {
+		delete map_file;
+	}
+}
diff --git a/BMap/BMExports.hpp b/BMap/BMExports.hpp
index 0665e47..3593795 100644
--- a/BMap/BMExports.hpp
+++ b/BMap/BMExports.hpp
@@ -11,10 +11,10 @@ LIBCMO_EXPORT void BMDispose();
 
 #pragma region BMFile
 
-//LIBCMO_EXPORT BMap::BMFile* BMFile_Load(const char* file_name, const char* temp_folder, const char* texture_folder, const char* encoding);
-//LIBCMO_EXPORT BMap::BMFile* BMFile_Create();
-//LIBCMO_EXPORT bool BMFile_Save(BMap::BMFile* map_file, const char* file_name, int compreess_level);
-//LIBCMO_EXPORT void BMFile_Free(BMap::BMFile* map_file);
+LIBCMO_EXPORT BMap::BMFile* BMFile_Load(LibCmo::CKSTRING file_name, LibCmo::CKSTRING temp_folder, LibCmo::CKSTRING texture_folder, LibCmo::CKDWORD encoding_count, LibCmo::CKSTRING encodings[]);
+LIBCMO_EXPORT BMap::BMFile* BMFile_Create(LibCmo::CKSTRING temp_folder, LibCmo::CKSTRING texture_folder, LibCmo::CKDWORD encoding_count, LibCmo::CKSTRING encodings[]);
+LIBCMO_EXPORT bool BMFile_Save(BMap::BMFile* map_file, LibCmo::CKSTRING file_name, LibCmo::CKINT compreess_level);
+LIBCMO_EXPORT void BMFile_Free(BMap::BMFile* map_file);
 
 #pragma endregion
 
diff --git a/BMap/BMap.cpp b/BMap/BMap.cpp
index 3cc861d..47c46f8 100644
--- a/BMap/BMap.cpp
+++ b/BMap/BMap.cpp
@@ -109,7 +109,7 @@ namespace BMap {
 
 		// do parse
 		DoRealParse();
-		
+
 		// check vertex overflow
 		if (m_ProcVertexs.size() > std::numeric_limits<LibCmo::CKWORD>::max()) {
 			return false;
@@ -216,11 +216,29 @@ namespace BMap {
 
 #pragma region BMfile
 
-	BMFile::BMFile(LibCmo::CKSTRING temp_folder, LibCmo::CKSTRING texture_folder, LibCmo::CKDWORD encoding_count, LibCmo::CKSTRING encodings[], bool is_reader) {
-	
+	BMFile::BMFile(LibCmo::CKSTRING temp_folder, LibCmo::CKSTRING texture_folder, LibCmo::CKDWORD encoding_count, LibCmo::CKSTRING encodings[], bool is_reader) :
+		m_IsReader(is_reader), m_IsFailed(false) {
+		m_Context = new LibCmo::CK2::CKContext();
+		// set temp folder and texture folder
+		auto pm = m_Context->GetPathManager();
+		m_IsFailed = m_IsFailed || !pm->AddPath(texture_folder);
+		m_IsFailed = m_IsFailed || !pm->SetTempFolder(temp_folder);
+		// set encoding
+		LibCmo::XContainer::XArray<LibCmo::XContainer::XString> cache;
+		for (LibCmo::CKDWORD i = 0; i < encoding_count; ++i) {
+			if (encodings[i] != nullptr)
+				cache.emplace_back(encodings[i]);
+		}
+		m_Context->SetEncoding(cache);
 	}
 
-	BMFile::~BMFile() {}
+	BMFile::~BMFile() {
+		delete m_Context;
+	}
+
+	bool BMFile::IsFailed() {
+		return m_IsFailed;
+	}
 
 	bool BMFile::Load(LibCmo::CKSTRING filename) {
 		return false;
@@ -247,12 +265,12 @@ LibCmo::CK2::ObjImpls::CK ## namepart * BMFile::Create ## namepart (LibCmo::CKST
 	if (obj != nullptr) m_Obj ## namepart ## s.emplace_back(obj); \
 	return obj; \
 }
-	
+
 	VISITOR_IMPL(Group, GROUP)
-	VISITOR_IMPL(3dObject, 3DOBJECT)
-	VISITOR_IMPL(Mesh, MESH)
-	VISITOR_IMPL(Material, MATERIAL)
-	VISITOR_IMPL(Texture, TEXTURE)
+		VISITOR_IMPL(3dObject, 3DOBJECT)
+		VISITOR_IMPL(Mesh, MESH)
+		VISITOR_IMPL(Material, MATERIAL)
+		VISITOR_IMPL(Texture, TEXTURE)
 
 #undef VISITOR_IMPL
 
diff --git a/BMap/BMap.hpp b/BMap/BMap.hpp
index 8698f36..00fb988 100644
--- a/BMap/BMap.hpp
+++ b/BMap/BMap.hpp
@@ -30,6 +30,7 @@ namespace BMap {
 	public:
 		BMMeshTransition();
 		~BMMeshTransition();
+		LIBCMO_DISABLE_COPY_MOVE(BMMeshTransition);
 
 		void PrepareVertexCount(LibCmo::CKDWORD count);
 		LibCmo::VxMath::VxVector3* PrepareVertex();
@@ -75,7 +76,9 @@ namespace BMap {
 	public:
 		BMFile(LibCmo::CKSTRING temp_folder, LibCmo::CKSTRING texture_folder, LibCmo::CKDWORD encoding_count, LibCmo::CKSTRING encodings[], bool is_reader);
 		~BMFile();
+		LIBCMO_DISABLE_COPY_MOVE(BMFile);
 
+		bool IsFailed();
 		bool Load(LibCmo::CKSTRING filename);
 		bool Save(LibCmo::CKSTRING filename, LibCmo::CKINT compress_level);
 
@@ -93,6 +96,7 @@ LibCmo::CK2::ObjImpls::CK ## namepart * Create ## namepart (LibCmo::CKSTRING nam
 #undef VISITOR_DECL
 
 	private:
+		bool m_IsFailed;
 		bool m_IsReader;
 		LibCmo::CK2::CKContext* m_Context;
 
diff --git a/LibCmo/CK2/CKContext.cpp b/LibCmo/CK2/CKContext.cpp
index aea1ed6..915b9bd 100644
--- a/LibCmo/CK2/CKContext.cpp
+++ b/LibCmo/CK2/CKContext.cpp
@@ -309,7 +309,7 @@ namespace LibCmo::CK2 {
 		}
 	}
 
-	void CKContext::SetEncoding(const XContainer::XArray<XContainer::XString> encoding_series) {
+	void CKContext::SetEncoding(const XContainer::XArray<XContainer::XString>& encoding_series) {
 		// free all current series
 		for (const auto& encoding : this->m_NameEncoding) {
 			LibCmo::EncodingHelper::DestroyEncodingToken(encoding);
diff --git a/LibCmo/CK2/CKContext.hpp b/LibCmo/CK2/CKContext.hpp
index 67e7eac..12a0f6b 100644
--- a/LibCmo/CK2/CKContext.hpp
+++ b/LibCmo/CK2/CKContext.hpp
@@ -102,7 +102,7 @@ namespace LibCmo::CK2 {
 	public:
 		void GetUtf8String(const XContainer::XString& native_name, XContainer::XString& u8_name);
 		void GetNativeString(const XContainer::XString& u8_name, XContainer::XString& native_name);
-		void SetEncoding(const XContainer::XArray<XContainer::XString> encoding_series);
+		void SetEncoding(const XContainer::XArray<XContainer::XString>& encoding_series);
 		
 	protected:
 		XContainer::XArray<EncodingHelper::ENCODING_TOKEN> m_NameEncoding;
diff --git a/LibCmo/CK2/MgrImpls/CKPathManager.cpp b/LibCmo/CK2/MgrImpls/CKPathManager.cpp
index 31bfee9..bef6e4a 100644
--- a/LibCmo/CK2/MgrImpls/CKPathManager.cpp
+++ b/LibCmo/CK2/MgrImpls/CKPathManager.cpp
@@ -22,6 +22,8 @@ namespace LibCmo::CK2::MgrImpls {
 	CKPathManager::~CKPathManager() {}
 
 	bool CKPathManager::SetTempFolder(CKSTRING u8_temp) {
+		if (u8_temp == nullptr) return false;
+
 		std::filesystem::path cache;
 		EncodingHelper::U8PathToStdPath(cache, u8_temp);
 		if (std::filesystem::is_directory(cache)) {
@@ -39,6 +41,8 @@ namespace LibCmo::CK2::MgrImpls {
 	}
 
 	XContainer::XString CKPathManager::GetTempFilePath(CKSTRING u8_filename) {
+		if (u8_filename == nullptr) return XContainer::XString();
+
 		std::filesystem::path stdfilename;
 		EncodingHelper::U8PathToStdPath(stdfilename, u8_filename);
 		auto realfile = this->m_TempFolder / stdfilename;
@@ -50,6 +54,7 @@ namespace LibCmo::CK2::MgrImpls {
 
 	bool CKPathManager::AddPath(CKSTRING u8path) {
 		if (u8path == nullptr) return false;
+
 		std::filesystem::path newpath;
 		EncodingHelper::U8PathToStdPath(newpath, u8path);
 		if (std::filesystem::is_directory(newpath)) {