diff --git a/etk/archive/Archive.cpp b/etk/archive/Archive.cpp
index ee79256..f63fb14 100644
--- a/etk/archive/Archive.cpp
+++ b/etk/archive/Archive.cpp
@@ -46,3 +46,28 @@ etk::Archive* etk::Archive::Load(const etk::UString& _fileName)
 }
 
 
+void etk::Archive::Open(const etk::UString& _key)
+{
+	if (m_content.Exist(_key)==false) {
+		TK_ERROR("Try open an unexistant file : '" << _key << "'");
+		return;
+	}
+	if (m_content[_key].GetNumberOfRef()==-1) {
+		LoadFile(m_content.GetId(_key));
+		m_content[_key].IncreaseRef();
+	}
+	m_content[_key].IncreaseRef();
+}
+
+void etk::Archive::Close(const etk::UString& _key)
+{
+	if (m_content.Exist(_key)==false) {
+		TK_ERROR("Try close an unexistant file : '" << _key << "'");
+		return;
+	}
+	if (m_content[_key].GetNumberOfRef()==0){
+		TK_ERROR("Try close one more time the file : '" << _key << "'");
+	} else {
+		m_content[_key].DecreaseRef();
+	}
+}
diff --git a/etk/archive/Archive.h b/etk/archive/Archive.h
index 8503177..f2b84c7 100644
--- a/etk/archive/Archive.h
+++ b/etk/archive/Archive.h
@@ -21,9 +21,19 @@ namespace etk
 			class Content
 			{
 				private:
-					etk::Vector<char> m_data; // if null ==> this is a folder...
+					int32_t m_link; //!< number of element open on this file
 				public:
-					Content(esize_t _basicSize=0) : m_data(_basicSize) { m_data.ReSize(_basicSize, 0); };
+					void IncreaseRef(void) { m_link++; };
+					void DecreaseRef(void) { m_link--; };
+					int32_t GetNumberOfRef(void) const { return m_link; };
+				private:
+					esize_t m_theoricSize; //!< number of element open on this file
+				public:
+					esize_t GetTheoricSize(void) const { return m_theoricSize; };
+				private:
+					etk::Vector<char> m_data;
+				public:
+					Content(esize_t _basicSize=0) : m_link(-1), m_theoricSize(_basicSize) { };
 					esize_t Size(void) const { return m_data.Size(); };
 					void* Data(void) const { return (void*)&m_data[0]; };
 					etk::Vector<char>& GetDataVector(void) { return m_data; };
@@ -71,10 +81,26 @@ namespace etk
 			 * @return true if the file is present
 			 */
 			bool Exist(const etk::UString& _key) const { return m_content.Exist(_key); };
+			/**
+			 * @brief Load the specific file in the memory
+			 * @param[in] _key Name of the file
+			 */
+			void Open(const etk::UString& _key);
+			/**
+			 * @brief Un-Load the specific file from the memory
+			 * @param[in] _key Name of the file
+			 */
+			void Close(const etk::UString& _key);
 			/**
 			 * @brief Display all Element in the archive
 			 */
 			void Display(void);
+		protected:
+			/**
+			 * @brief Request the load in memory of the concerned file.
+			 * @param[in] _id Id of the file to load.
+			 */
+			virtual void LoadFile(int32_t _id) { };
 		public:
 			/**
 			 * @brief Load an Achive with a specific name.
diff --git a/etk/archive/Zip.cpp b/etk/archive/Zip.cpp
index b234f60..775ef38 100644
--- a/etk/archive/Zip.cpp
+++ b/etk/archive/Zip.cpp
@@ -44,6 +44,8 @@ etk::archive::Zip::Zip(const etk::UString& _fileName) :
 			}
 			int error = UNZ_OK;
 			m_content.Add(tmpFileName, etk::Archive::Content(tmpFileInfo.uncompressed_size));
+			// request the resize of the data :
+			m_content[tmpFileName].GetDataVector().ReSize(tmpFileInfo.uncompressed_size, 0);
 			void* data = m_content[tmpFileName].Data();
 			if(NULL == data) {
 				TK_ERROR("Allocation error...");
@@ -78,3 +80,7 @@ etk::archive::Zip::~Zip(void)
 	};
 };
 
+void etk::archive::Zip::LoadFile(int32_t _id)
+{
+	TK_WARNING("Load file Here ... : " << _id << " = '" << m_content.GetKey(_id) << "'");
+}
diff --git a/etk/archive/Zip.h b/etk/archive/Zip.h
index 83b97b9..195c53d 100644
--- a/etk/archive/Zip.h
+++ b/etk/archive/Zip.h
@@ -26,6 +26,8 @@ namespace etk
 			public:
 				Zip(const etk::UString& _fileName);
 				virtual ~Zip(void);
+			protected: // herited functions :
+				virtual void LoadFile(int32_t _id);
 		};
 	};
 };
diff --git a/etk/os/FSNode.cpp b/etk/os/FSNode.cpp
index 2b11fc9..a7c09af 100644
--- a/etk/os/FSNode.cpp
+++ b/etk/os/FSNode.cpp
@@ -1321,7 +1321,7 @@ uint64_t etk::FSNode::FileSize(void)
 	if(    etk::FSN_TYPE_DATA == m_type
 	    || etk::FSN_TYPE_THEME_DATA == m_type) {
 		if (true == LoadDataZip()) {
-			return m_zipContent->Size();
+			return m_zipContent->GetTheoricSize();
 		}
 		return 0;
 	}