diff --git a/PyCmo/PyCmo.py b/PyCmo/PyCmo.py
index 0bb6ec9..4a44cda 100644
--- a/PyCmo/PyCmo.py
+++ b/PyCmo/PyCmo.py
@@ -1,7 +1,7 @@
 import VTReader, VTStruct, VTConstants
 
 ckFile = VTStruct.CKFile()
-VTReader.CKFileReader.Load(ckFile, "D:\\libcmo21\\PyCmo\\Language.nmo", VTConstants.CK_LOAD_FLAGS(VTConstants.CK_LOAD_FLAGS.CK_LOAD_DEFAULT))
+VTReader.CKFileReader.Load(ckFile, "D:\\libcmo21\\PyCmo\\Language.old.nmo", VTConstants.CK_LOAD_FLAGS(VTConstants.CK_LOAD_FLAGS.CK_LOAD_DEFAULT))
 print(ckFile)
 print(str(ckFile.m_FileObjects))
 
diff --git a/Unvirt/AccessibleValue.cpp b/Unvirt/AccessibleValue.cpp
index 0f9cc5b..31da055 100644
--- a/Unvirt/AccessibleValue.cpp
+++ b/Unvirt/AccessibleValue.cpp
@@ -231,30 +231,31 @@ namespace Unvirt {
 
 		void GetAccessibleFileSize(std::string& strl, uint64_t size) {
 			static double denominator = (double)0b1111111111;
+			uint64_t probe = size;
 
 			// check bytes
-			if ((size >> 10) == UINT64_C(0)) {
-				StringHelper::StdstringPrintf(strl, "%" PRIu64 "Bytes", size);
+			if ((probe >> 10) == UINT64_C(0)) {
+				StringHelper::StdstringPrintf(strl, "%" PRIu64 "Bytes", probe);
 				return;
 			}
-			size >>= 10;
+			probe >>= 10;
 
 			// check kb
-			if ((size >> 10) == UINT64_C(0)) {
-				StringHelper::StdstringPrintf(strl, "%.2lfKiB", size / denominator);
+			if ((probe >> 10) == UINT64_C(0)) {
+				StringHelper::StdstringPrintf(strl, "%.2lfKiB", size / static_cast<double>(UINT64_C(1) << 10));
 				return;
 			}
-			size >>= 10;
+			probe >>= 10;
 
 			// check mb
-			if ((size >> 10) == UINT64_C(0)) {
-				StringHelper::StdstringPrintf(strl, "%.2lfMiB", size / denominator);
+			if ((probe >> 10) == UINT64_C(0)) {
+				StringHelper::StdstringPrintf(strl, "%.2lfMiB", size / static_cast<double>(UINT64_C(1) << 20));
 				return;
 			}
-			size >>= 10;
+			probe >>= 10;
 
 			// otherwise gb
-			StringHelper::StdstringPrintf(strl, "%.2lfGiB", size / denominator);
+			StringHelper::StdstringPrintf(strl, "%.2lfGiB", size / static_cast<double>(UINT64_C(1) << 30));
 			return;
 
 		}
diff --git a/Unvirt/CmdHelper.cpp b/Unvirt/CmdHelper.cpp
index fe2efed..15d7dc4 100644
--- a/Unvirt/CmdHelper.cpp
+++ b/Unvirt/CmdHelper.cpp
@@ -1,5 +1,10 @@
 #include "CmdHelper.hpp"
 #include "TerminalHelper.hpp"
+#include "VTUtils.hpp"
+#include "VTEncoding.hpp"
+#include <iostream>
+
+/*
 
 namespace Unvirt {
 	namespace CmdHelper {
@@ -15,7 +20,7 @@ namespace Unvirt {
 			;
 		}
 
-		std::vector<std::string> CmdSplitter::Convert(const std::string& u8cmd) {
+		const std::vector<std::string> CmdSplitter::Convert(const std::string& u8cmd) {
 			// set up variables
 			std::vector<std::string> result;
 			std::string buffer;
@@ -129,7 +134,7 @@ namespace Unvirt {
 			if (search == mShortNameMapping.end()) return nullptr;
 			return GetDescByLongName((*search).second);
 		}
-		OptionDescription* OptionsDescription::GetDescByPosition(int pos) {
+		OptionDescription* OptionsDescription::GetDescByPosition(size_t pos) {
 			if (pos >= mPositionalArgMapping.size()) return nullptr;
 			return GetDescByLongName(mPositionalArgMapping[pos]);
 		}
@@ -167,7 +172,7 @@ namespace Unvirt {
 			mDataPair.clear();
 		}
 
-		bool VariablesMap::AddPair(std::string& name, CmdArgType t, std::string& val) {
+		bool VariablesMap::AddPair(const std::string& name, CmdArgType t, const std::string& val) {
 			if (mDataPair.contains(name)) return false;
 
 			AnyVariable var;
@@ -206,41 +211,75 @@ namespace Unvirt {
 			}
 
 			mDataPair.emplace(name, std::move(var));
+			return true;
 		}
 
 #pragma endregion
 
 #pragma region ExecEnvironment
 
-		ExecEnvironment::ExecEnvironment() {
+		ExecEnvironment::ExecEnvironment() :
+			mVtFile(nullptr), mVtFileEnv(nullptr) {
+			;
 		}
 
 		ExecEnvironment::~ExecEnvironment() {
+			if (mVtFile != nullptr) delete mVtFile;
+			if (mVtFileEnv != nullptr) delete mVtFileEnv;
 		}
 
 		void ExecEnvironment::ProcLoad(OptionsDescription& od, VariablesMap& vm) {
+			if (mVtFile != nullptr || mVtFileEnv != nullptr) {
+				printf(UNVIRT_TERMCOL_LIGHT_RED(("Please close current opened Vrtools file first.\n")));
+				return;
+			}
+
+			const char* filename = vm.GetData<char>("file");
+			if (filename == nullptr) {
+				printf(UNVIRT_TERMCOL_LIGHT_RED(("You should specify a file first.\n")));
+				od.PrintHelp(stdout);
+				return;
+			}
+
+			mVtFileEnv = new LibCmo::Utils::VirtoolsContext();
+			const char* enc = vm.GetData<char>("encoding");
+			mVtFileEnv->NameEncoding = enc == nullptr ? "" : enc;
+
+			mVtFile = new LibCmo::CKFile(*mVtFileEnv);
+			mVtFile->Load(filename, LibCmo::CK_LOAD_FLAGS::CK_LOAD_DEFAULT);
 		}
 
 		void ExecEnvironment::ProcInfo(OptionsDescription& od, VariablesMap& vm) {
+			printf(UNVIRT_TERMCOL_LIGHT_RED(("Sorry. This feature is not supported now.\n")));
 		}
 
 		void ExecEnvironment::ProcClear(OptionsDescription& od, VariablesMap& vm) {
+			if (mVtFile == nullptr && mVtFileEnv == nullptr) {
+				printf(UNVIRT_TERMCOL_LIGHT_RED(("Virtools file already is empty.\n")));
+				return;
+			}
+
+			if (mVtFile != nullptr) delete mVtFile;
+			if (mVtFileEnv != nullptr) delete mVtFileEnv;
+
+			mVtFile = nullptr;
+			mVtFileEnv = nullptr;
 		}
 
 		void ExecEnvironment::ProcExportSql(OptionsDescription& od, VariablesMap& vm) {
+			printf(UNVIRT_TERMCOL_LIGHT_RED(("Sorry. This feature is not supported now.\n")));
 		}
 
 
 #pragma endregion
 
-
 #pragma region InteractiveCmd
 
 		InteractiveCmd::InteractiveCmd() :
-			mCmdDispatcher(), mExecEnv(), mVm(), mBlank()
-		{
+			mCmdDispatcher(), mExecEnv(), mVm(), mBlank(), mExitRunFlag(false), mCmdSplitter() {
 			// add load subcommand
 			CmdRegisteryEntry entryLoad;
+			const std::string entryLoadName = "load";
 			entryLoad.mSubCmdDesc = "Load Virtools file.";
 			entryLoad.mOptDesc.AddOption("file", 'f', CmdArgType::STRING, "The loaded Virtools file.");
 			entryLoad.mOptDesc.AddPositionalOption("file");
@@ -249,33 +288,57 @@ namespace Unvirt {
 			entryLoad.mOptDesc.AddOption("temp", 't', CmdArgType::STRING, "The temp folder used by engine.");
 			entryLoad.mOptDesc.AddPositionalOption("temp");
 			entryLoad.mBindProc = std::bind(&ExecEnvironment::ProcLoad, &this->mExecEnv, std::placeholders::_1, std::placeholders::_2);
-			mCmdDispatcher.emplace("load", std::move(entryLoad));
+			//mCmdDispatcher.emplace("load", std::move(entryLoad));
 
 			CmdRegisteryEntry entryInfo;
 			entryInfo.mSubCmdDesc = "Show loaded Virtools file header info.";
 			entryInfo.mBindProc = std::bind(&ExecEnvironment::ProcInfo, &this->mExecEnv, std::placeholders::_1, std::placeholders::_2);
-			mCmdDispatcher.emplace("info", std::move(entryInfo));
+			//mCmdDispatcher.emplace("info", std::move(entryInfo));
 
 			CmdRegisteryEntry entryClear;
 			entryClear.mSubCmdDesc = "Clear current loaded Virtools file.";
 			entryClear.mBindProc = std::bind(&ExecEnvironment::ProcClear, &this->mExecEnv, std::placeholders::_1, std::placeholders::_2);
-			mCmdDispatcher.emplace("clear", std::move(entryClear));
+			//mCmdDispatcher.emplace("clear", std::move(entryClear));
 
 			CmdRegisteryEntry entryExportSql;
 			entryExportSql.mSubCmdDesc = "Export loaded Virtools file as a SQList database file.";
 			entryExportSql.mOptDesc.AddOption("file", 'f', CmdArgType::STRING, "The exported SQL file.");
 			entryExportSql.mOptDesc.AddPositionalOption("file");
 			entryExportSql.mBindProc = std::bind(&ExecEnvironment::ProcExportSql, &this->mExecEnv, std::placeholders::_1, std::placeholders::_2);
-			mCmdDispatcher.emplace("sql", std::move(entryExportSql));
+			//mCmdDispatcher.emplace("sql", std::move(entryExportSql));
+
+			CmdRegisteryEntry entryExit;
+			entryExit.mSubCmdDesc = "Exit this interactive commander.";
+			entryExit.mBindProc = std::bind(&InteractiveCmd::ProcExit, this, std::placeholders::_1, std::placeholders::_2);
+			//mCmdDispatcher.emplace("exit", std::move(entryExit));
 
 		}
 
 		InteractiveCmd::~InteractiveCmd() {
-
+			;
 		}
 
 		void InteractiveCmd::Run(void) {
+			std::string u8cmd;
 
+			mExitRunFlag = false;
+			while (!mExitRunFlag) {
+				// get command
+				GetCmdLine(u8cmd);
+
+				// split cmd and parse it
+				CmdParser(mCmdSplitter.Convert(u8cmd));
+			}
+		}
+
+		void InteractiveCmd::GetCmdLine(std::string& u8cmd) {
+#if defined(LIBCMO_OS_WIN32)
+			std::wstring wcmd;
+			std::getline(std::wcin, wcmd);
+			LibCmo::Encoding::WcharToChar(wcmd, u8cmd, CP_UTF8);
+#else
+			std::getline(std::cin, u8cmd);
+#endif
 		}
 
 		void InteractiveCmd::CmdParser(const std::vector<std::string>& args) {
@@ -316,7 +379,7 @@ namespace Unvirt {
 						optsDesc.PrintHelp(f);
 						return;
 					}
-					optsDesc.GetDescByShortName(opt[1]);
+					optDesc = optsDesc.GetDescByShortName(opt[1]);
 				} else {
 					// position
 					optDesc = optsDesc.GetDescByPosition(position_counter++);
@@ -330,11 +393,17 @@ namespace Unvirt {
 				}
 
 				// get value
+				bool add_success = true;
 				switch (optDesc->mType) {
 					case CmdArgType::NONE:
 						// just a switch
-						mVm.AddPair(optDesc->mLongName, optDesc->mType, this->mBlank);
+						add_success = mVm.AddPair(optDesc->mLongName, optDesc->mType, this->mBlank);
 						++arg;
+						if (!add_success) {
+							fprintf(f, UNVIRT_TERMCOL_LIGHT_RED(("Error!  Duplicated option \"%s\"! \n")), opt.c_str());
+							optsDesc.PrintHelp(f);
+							return;
+						}
 						break;
 					case CmdArgType::INT:
 					case CmdArgType::STRING:
@@ -345,8 +414,13 @@ namespace Unvirt {
 							optsDesc.PrintHelp(f);
 							return;
 						}
-						mVm.AddPair(optDesc->mLongName, optDesc->mType, *arg);
+						add_success = mVm.AddPair(optDesc->mLongName, optDesc->mType, *arg);
 						++arg;
+						if (!add_success) {
+							fprintf(f, UNVIRT_TERMCOL_LIGHT_RED(("Error!  Duplicated option \"%s\"! \n")), opt.c_str());
+							optsDesc.PrintHelp(f);
+							return;
+						}
 						break;
 					default:
 						throw std::invalid_argument("Invalid Option Type.");
@@ -364,8 +438,13 @@ namespace Unvirt {
 			}
 		}
 
+		void InteractiveCmd::ProcExit(OptionsDescription&, VariablesMap&) {
+			mExitRunFlag = true;
+		}
+
 #pragma endregion
 
-
+		}
 	}
-}
\ No newline at end of file
+
+*/
\ No newline at end of file
diff --git a/Unvirt/CmdHelper.hpp b/Unvirt/CmdHelper.hpp
index efbcfa5..03b5c18 100644
--- a/Unvirt/CmdHelper.hpp
+++ b/Unvirt/CmdHelper.hpp
@@ -6,6 +6,10 @@
 #include <vector>
 #include <unordered_map>
 #include <stdexcept>
+#include "VTUtils.hpp"
+#include "VTStruct.hpp"
+
+/*
 
 namespace Unvirt {
 	namespace CmdHelper {
@@ -17,7 +21,7 @@ namespace Unvirt {
 			CmdSplitter& operator=(const CmdSplitter&) = delete;
 			~CmdSplitter();
 
-			std::vector<std::string> Convert(const std::string& u8cmd);
+			const std::vector<std::string> Convert(const std::string& u8cmd);
 		private:
 			char mCmdChar;
 			std::string* mBuffer;
@@ -154,7 +158,7 @@ namespace Unvirt {
 
 			OptionDescription* GetDescByLongName(const std::string& longname);
 			OptionDescription* GetDescByShortName(char shortname);
-			OptionDescription* GetDescByPosition(int pos);
+			OptionDescription* GetDescByPosition(size_t pos);
 
 			void PrintHelp(FILE* f);
 		private:
@@ -186,7 +190,7 @@ namespace Unvirt {
 			/// <param name="t"></param>
 			/// <param name="val"></param>
 			/// <returns>return false when this opt is existed.</returns>
-			bool AddPair(std::string& name, CmdArgType t, std::string& val);
+			bool AddPair(const std::string& name, CmdArgType t, const std::string& val);
 			bool Contain(const char* opt) {
 				if (opt == nullptr) throw std::invalid_argument("Invalid Option Name.");
 				return mDataPair.contains(opt);
@@ -220,7 +224,8 @@ namespace Unvirt {
 			void ProcClear(OptionsDescription&, VariablesMap&);
 			void ProcExportSql(OptionsDescription&, VariablesMap&);
 		private:
-
+			LibCmo::CKFile* mVtFile;
+			LibCmo::Utils::VirtoolsContext* mVtFileEnv;
 		};
 
 		class InteractiveCmd {
@@ -233,14 +238,20 @@ namespace Unvirt {
 			void Run(void);
 
 		private:
+			void GetCmdLine(std::string& u8cmd);
 			void CmdParser(const std::vector<std::string>& args);
 			void PrintHelp(FILE* f);
 
+			void ProcExit(OptionsDescription&, VariablesMap&);
+
 			std::unordered_map<std::string, CmdRegisteryEntry> mCmdDispatcher;
+			CmdSplitter mCmdSplitter;
 			ExecEnvironment mExecEnv;
 			VariablesMap mVm;
 			std::string mBlank;
+			bool mExitRunFlag;
 		};
 
 	}
-}
\ No newline at end of file
+}
+*/
\ No newline at end of file
diff --git a/Unvirt/StringHelper.cpp b/Unvirt/StringHelper.cpp
index aa28498..d704d52 100644
--- a/Unvirt/StringHelper.cpp
+++ b/Unvirt/StringHelper.cpp
@@ -17,7 +17,7 @@ namespace Unvirt {
 			strl.resize(count);
 			int write_result = _vsnprintf(strl.data(), count, format, argptr);
 
-			if (write_result < 0 || write_result >= count) throw new std::length_error("Invalid write_result in _vsnprintf.");
+			if (write_result < 0 || write_result > count) throw new std::length_error("Invalid write_result in _vsnprintf.");
 		}
 
 	}
diff --git a/Unvirt/StructFormatter.cpp b/Unvirt/StructFormatter.cpp
new file mode 100644
index 0000000..775adab
--- /dev/null
+++ b/Unvirt/StructFormatter.cpp
@@ -0,0 +1,61 @@
+#include "StructFormatter.hpp"
+#include "AccessibleValue.hpp"
+#include "TerminalHelper.hpp"
+
+namespace Unvirt {
+	namespace StructFormatter {
+
+		static FILE* fout = stdout;
+
+		void PrintCKFileInfo(const LibCmo::CKFileInfo& fileinfo) {
+			std::string container;
+
+			fputs(UNVIRT_TERMCOL_LIGHT_YELLOW(("CKFileInfo\n")), fout);
+			fprintf(fout, "Version (File / CK): %" PRIu32 " / 0x%08" PRIX32 "\n",
+				fileinfo.FileVersion, fileinfo.CKVersion
+			);
+
+			LibCmo::CKDWORD product_series[4]{
+				(fileinfo.ProductBuild >> 24) & 0xFF,
+				(fileinfo.ProductBuild >> 16) & 0xFF,
+				(fileinfo.ProductBuild >> 8) & 0xFF,
+				(fileinfo.ProductBuild >> 0) & 0xFF,
+			};
+			fprintf(fout, "Product (Version / Build): %" PRIu32 " / %" PRIu32 ".%" PRIu32 ".%" PRIu32 ".%" PRIu32 "\n",
+				fileinfo.ProductVersion, product_series[0], product_series[1], product_series[2], product_series[3]
+			);
+
+			Unvirt::AccessibleValue::GetFlagEnumName<LibCmo::CK_FILE_WRITEMODE>(
+				Unvirt::AccessibleValue::EnumDesc::CK_FILE_WRITEMODE, container, fileinfo.FileWriteMode
+				);
+			fprintf(fout, "Save Flags: %s\n", container.c_str());
+
+			Unvirt::AccessibleValue::GetAccessibleFileSize(container, fileinfo.FileSize);
+			fprintf(fout, "File Size: %s\n", container.c_str());
+
+			fprintf(fout, "Crc: 0x%" PRIX32 "\n", fileinfo.Crc);
+			fputc('\n', fout);
+
+
+			fputs("Hdr1 (Pack / UnPack): ", fout);
+			Unvirt::AccessibleValue::GetAccessibleFileSize(container, fileinfo.Hdr1PackSize);
+			fprintf(fout, "%s / ", container.c_str());
+			Unvirt::AccessibleValue::GetAccessibleFileSize(container, fileinfo.Hdr1UnPackSize);
+			fprintf(fout, "%s\n", container.c_str());
+
+			fputs("Data (Pack / UnPack): ", fout);
+			Unvirt::AccessibleValue::GetAccessibleFileSize(container, fileinfo.DataPackSize);
+			fprintf(fout, "%s / ", container.c_str());
+			Unvirt::AccessibleValue::GetAccessibleFileSize(container, fileinfo.DataUnPackSize);
+			fprintf(fout, "%s\n", container.c_str());
+			fputc('\n', fout);
+
+
+			fprintf(fout, "Manager Count: %" PRIu32 "\nObject Count: %" PRIu32 "\nMax ID Saved: %" PRIu32 "\n",
+				fileinfo.ManagerCount, fileinfo.ObjectCount, fileinfo.MaxIDSaved
+			);
+
+		}
+
+	}
+}
diff --git a/Unvirt/StructFormatter.hpp b/Unvirt/StructFormatter.hpp
new file mode 100644
index 0000000..6e3c245
--- /dev/null
+++ b/Unvirt/StructFormatter.hpp
@@ -0,0 +1,11 @@
+#pragma once
+
+#include "VTStruct.hpp"
+
+namespace Unvirt {
+	namespace StructFormatter {
+
+		void PrintCKFileInfo(const LibCmo::CKFileInfo& fileinfo);
+
+	}
+}
diff --git a/Unvirt/Unvirt.cpp b/Unvirt/Unvirt.cpp
index 24e92de..bdd11d4 100644
--- a/Unvirt/Unvirt.cpp
+++ b/Unvirt/Unvirt.cpp
@@ -1,6 +1,6 @@
 #include "AccessibleValue.hpp"
 #include "TerminalHelper.hpp"
-#include "CmdHelper.hpp"
+#include "StructFormatter.hpp"
 #include "VTStruct.hpp"
 #include <cstdio>
 #include <iostream>
@@ -13,12 +13,7 @@ int main(int argc, char* argv[]) {
 	LibCmo::CKFile vtfile(vtctx);
 	vtfile.Load("Language.old.nmo", LibCmo::CK_LOAD_FLAGS::CK_LOAD_DEFAULT);
 
-	//printf(UNVIRT_TERMCOL_LIGHT_YELLOW(("Hello, %s\n")), u8"㴮!");
-
-	//std::string bbb("load \"Language. 㴮!old.nmo\" utf8 ");
-	//Unvirt::CmdHelper::CmdSplitter sp;
-	//auto a = sp.Convert(bbb);
-	//printf(UNVIRT_TERMCOL_LIGHT_YELLOW(("%s\n")), a[1].c_str());
+	Unvirt::StructFormatter::PrintCKFileInfo(vtfile.m_FileInfo);
 
 	return 0;
 }
diff --git a/Unvirt/Unvirt.vcxproj b/Unvirt/Unvirt.vcxproj
index 91f3083..d6aebc3 100644
--- a/Unvirt/Unvirt.vcxproj
+++ b/Unvirt/Unvirt.vcxproj
@@ -173,6 +173,7 @@
   <ItemGroup>
     <ClCompile Include="AccessibleValue.cpp" />
     <ClCompile Include="CmdHelper.cpp" />
+    <ClCompile Include="StructFormatter.cpp" />
     <ClCompile Include="TerminalHelper.cpp" />
     <ClCompile Include="StringHelper.cpp" />
     <ClCompile Include="Unvirt.cpp" />
@@ -180,6 +181,7 @@
   <ItemGroup>
     <ClInclude Include="AccessibleValue.hpp" />
     <ClInclude Include="CmdHelper.hpp" />
+    <ClInclude Include="StructFormatter.hpp" />
     <ClInclude Include="TerminalHelper.hpp" />
     <ClInclude Include="StringHelper.hpp" />
   </ItemGroup>
diff --git a/Unvirt/Unvirt.vcxproj.filters b/Unvirt/Unvirt.vcxproj.filters
index c92a160..23cb78b 100644
--- a/Unvirt/Unvirt.vcxproj.filters
+++ b/Unvirt/Unvirt.vcxproj.filters
@@ -30,6 +30,9 @@
     <ClCompile Include="CmdHelper.cpp">
       <Filter>Sources</Filter>
     </ClCompile>
+    <ClCompile Include="StructFormatter.cpp">
+      <Filter>Sources</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="AccessibleValue.hpp">
@@ -44,5 +47,8 @@
     <ClInclude Include="CmdHelper.hpp">
       <Filter>Headers</Filter>
     </ClInclude>
+    <ClInclude Include="StructFormatter.hpp">
+      <Filter>Headers</Filter>
+    </ClInclude>
   </ItemGroup>
 </Project>
\ No newline at end of file