diff --git a/DesktopEditor/common/File.h b/DesktopEditor/common/File.h
index 8d729de231..b6ebe04fe5 100644
--- a/DesktopEditor/common/File.h
+++ b/DesktopEditor/common/File.h
@@ -4,6 +4,7 @@
 #include <stdio.h>
 #include <string>
 #include <fstream>
+#include <time.h>
 #include "Array.h"
 #include "errno.h"
 #include "Base64.h"
@@ -569,7 +570,6 @@ namespace NSFile
 		{
 			return m_pFile;
 		}
-
 		inline long GetFileSize()
 		{
 			return m_lFileSize;
@@ -642,12 +642,12 @@ namespace NSFile
 			m_lFilePosition = 0;
 			return true;
 		}
-		bool SeekFile(int lFilePosition)
+		bool SeekFile(int lFilePosition, int nSeekMode = 0)
 		{
 			if (!m_pFile)
 				return false;
 
-			m_lFilePosition = fseek(m_pFile, lFilePosition, 0);
+			m_lFilePosition = fseek(m_pFile, lFilePosition, nSeekMode);
 			return true;
 		}
 		bool ReadFile(BYTE* pData, DWORD nBytesToRead, DWORD& dwSizeRead)
@@ -666,6 +666,25 @@ namespace NSFile
 			size_t nCountWrite = fwrite((void*)pData, 1, nBytesCount, m_pFile);
 			return true;
 		}
+		long TellFile()
+		{
+			if (!m_pFile)
+				return 0;
+
+			return ftell(m_pFile);
+		}
+		long SizeFile()
+		{
+			if (!m_pFile)
+				return 0;
+
+			long lPos = TellFile();
+			fseek(m_pFile, 0, SEEK_END);
+			m_lFileSize = ftell(m_pFile);
+			fseek(m_pFile, lPos, SEEK_SET);
+
+			return m_lFileSize;
+		}
 		void WriteStringUTF8(const std::wstring& strXml, bool bIsBOM = false)
 		{
 			BYTE* pData = NULL;
diff --git a/DesktopEditor/common/String.h b/DesktopEditor/common/String.h
index 91c275435b..006750d0ab 100644
--- a/DesktopEditor/common/String.h
+++ b/DesktopEditor/common/String.h
@@ -4,6 +4,7 @@
 #include "CPEncodings/CodePage.h"
 #include <vector>
 #include <sstream>
+#include <algorithm>
 
 namespace NSString
 {
@@ -234,6 +235,24 @@ namespace NSString
 
 		return arrElements;
 	}
+	static inline void ToLower(std::wstring& wsString)
+	{
+		std::transform(wsString.begin(), wsString.end(), wsString.begin(), ::towlower);
+	}
+	static inline void ToUpper(std::wstring& wsString)
+	{
+		std::transform(wsString.begin(), wsString.end(), wsString.begin(), ::towupper);
+	}
+	static inline void Replace(std::wstring& wsString, const std::wstring& wsFrom, const std::wstring& wsTo)
+	{
+		int nFromLen = wsFrom.length();
+		int nToLen = wsTo.length();
+		int nPos = -nToLen;
+		while (std::wstring::npos != (nPos = wsString.find(wsFrom, nPos + nToLen)))
+		{
+			wsString.replace(nPos, nFromLen, wsTo);
+		}
+	}
 };
 
 #endif // _BUILD_STRING_CROSSPLATFORM_H_