diff --git a/code/nel/include/nel/misc/system_utils.h b/code/nel/include/nel/misc/system_utils.h
index b0a0f66bd..c8e5b578f 100644
--- a/code/nel/include/nel/misc/system_utils.h
+++ b/code/nel/include/nel/misc/system_utils.h
@@ -44,6 +44,39 @@ public:
 
 	/// Create/update a progress bar with an appearance depending on system.
 	static bool updateProgressBar(uint value, uint total);
+
+	/// Copy a string to system clipboard.
+	static bool copyTextToClipboard(const ucstring &text);
+
+	/// Paste a string from system clipboard.
+	static bool pasteTextFromClipboard(ucstring &text);
+
+	/// Check if system supports unicode.
+	static bool supportUnicode();
+
+	/// Check if keyboard layout is AZERTY.
+	static bool isAzertyKeyboard();
+
+	/// Check if screensaver is enabled.
+	static bool isScreensaverEnabled();
+
+	/// Enable or disable screeensaver.
+	static bool enableScreensaver(bool screensaver);
+
+	/// Get the ROOT registry key used by getRegKey and setRegKey.
+	static std::string getRootKey();
+
+	/// Set the ROOT registry key used by getRegKey and setRegKey.
+	static void setRootKey(const std::string &root);
+
+	/// Read a value from registry.
+	static std::string getRegKey(const std::string &Entry);
+
+	/// Write a value to registry.
+	static bool setRegKey(const std::string &ValueName, const std::string &Value);
+
+	/// Get desktop current color depth without using UDriver.
+	static uint getCurrentColorDepth();
 };
 
 } // NLMISC
diff --git a/code/nel/src/misc/displayer.cpp b/code/nel/src/misc/displayer.cpp
index bc45dc4ae..93cb5be2c 100644
--- a/code/nel/src/misc/displayer.cpp
+++ b/code/nel/src/misc/displayer.cpp
@@ -38,6 +38,7 @@
 #include "nel/misc/path.h"
 #include "nel/misc/mutex.h"
 #include "nel/misc/report.h"
+#include "nel/misc/system_utils.h"
 
 #include "nel/misc/debug.h"
 
@@ -568,19 +569,7 @@ void CMsgBoxDisplayer::doDisplay ( const CLog::TDisplayInfo& args, const char *m
 
 	str += message;
 
-	if (OpenClipboard (NULL))
-	{
-		HGLOBAL mem = GlobalAlloc (GHND|GMEM_DDESHARE, str.size()+1);
-		if (mem)
-		{
-			char *pmem = (char *)GlobalLock (mem);
-			strcpy (pmem, str.c_str());
-			GlobalUnlock (mem);
-			EmptyClipboard ();
-			SetClipboardData (CF_TEXT, mem);
-		}
-		CloseClipboard ();
-	}
+	CSystemUtils::copyTextToClipboard(str);
 
 	// create the string on the screen
 	needSpace = false;
@@ -758,19 +747,7 @@ void CMsgBoxDisplayer::display (const std::string& str)
 {
 #ifdef NL_OS_WINDOWS
 
-	if (OpenClipboard (NULL))
-	{
-		HGLOBAL mem = GlobalAlloc (GHND|GMEM_DDESHARE, str.size()+1);
-		if (mem)
-		{
-			char *pmem = (char *)GlobalLock (mem);
-			strcpy (pmem, str.c_str());
-			GlobalUnlock (mem);
-			EmptyClipboard ();
-			SetClipboardData (CF_TEXT, mem);
-		}
-		CloseClipboard ();
-	}
+	CSystemUtils::copyTextToClipboard(str);
 
 	string strf = str;
 	strf += "\n\n(this message was copied in the clipboard)";
diff --git a/code/nel/src/misc/system_utils.cpp b/code/nel/src/misc/system_utils.cpp
index 8a4e5161a..f06f345f8 100644
--- a/code/nel/src/misc/system_utils.cpp
+++ b/code/nel/src/misc/system_utils.cpp
@@ -30,6 +30,10 @@
 
 using namespace std;
 
+// Key in registry
+static string RootKey;
+static const uint32 KeyMaxLength = 1024;
+
 namespace NLMISC {
 
 void *CSystemUtils::s_window = NULL;
@@ -95,4 +99,254 @@ bool CSystemUtils::updateProgressBar(uint value, uint total)
 	return true;
 }
 
+bool CSystemUtils::copyTextToClipboard(const ucstring &text)
+{
+	if (!text.size()) return false;
+
+	bool res = false;
+
+#ifdef NL_OS_WINDOWS
+	if (OpenClipboard(NULL))
+	{
+		// check if unicode format is supported by clipboard
+		bool isUnicode = (IsClipboardFormatAvailable(CF_UNICODETEXT) == TRUE);
+
+		// allocates a buffer to copy text in global memory
+		HGLOBAL mem = GlobalAlloc(GHND|GMEM_DDESHARE, (text.size()+1) * (isUnicode ? 2:1));
+
+		if (mem)
+		{
+			// create a lock on this buffer
+			void *hLock = GlobalLock(mem);
+
+			// copy text to this buffer
+			if (isUnicode)
+				wcscpy((wchar_t*)hLock, (const wchar_t*)text.c_str());
+			else
+				strcpy((char*)hLock, text.toString().c_str());
+
+			// unlock buffer
+			GlobalUnlock(mem);
+
+			// empty clipboard
+			EmptyClipboard();
+
+			// set new data to clipboard in the right format
+			SetClipboardData(isUnicode ? CF_UNICODETEXT:CF_TEXT, mem);
+
+			res = true;
+		}
+
+		CloseClipboard();
+	}
+#endif
+
+	return res;
+}
+
+bool CSystemUtils::pasteTextFromClipboard(ucstring &text)
+{
+	bool res = false;
+
+#ifdef NL_OS_WINDOWS
+	if (OpenClipboard(NULL))
+	{
+		// check if unicode format is supported by clipboard
+		bool isUnicode = (IsClipboardFormatAvailable(CF_UNICODETEXT) == TRUE);
+
+		// get data from clipboard (if not of this type, they are converted)
+		// warning, this code can't be debuggued in VC++ IDE, hObj will be always NULL
+		HANDLE hObj = GetClipboardData(isUnicode ? CF_UNICODETEXT:CF_TEXT);
+
+		if (hObj)
+		{
+			// create a lock on clipboard data
+			void *hLock = GlobalLock(hObj);
+
+			if (hLock != NULL)
+			{
+				// retrieve clipboard data
+				if (isUnicode)
+					text = (const ucchar*)hLock;
+				else
+					text = (const char*)hLock;
+
+				// unlock data
+				GlobalUnlock(hObj);
+
+				res = true;
+			}
+		}
+
+		CloseClipboard();
+	}
+#endif
+
+	return res;
+}
+
+bool CSystemUtils::supportUnicode()
+{
+	static bool init = false;
+	static bool unicodeSupported = false;
+	if (!init)
+	{
+		init = true;
+#ifdef NL_OS_WINDOWS
+		OSVERSIONINFO osvi;
+		osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
+
+		// get Windows version
+		if (GetVersionEx(&osvi))
+		{
+			if (osvi.dwPlatformId == VER_PLATFORM_WIN32_NT)
+			{
+				// unicode is supported since Windows NT 4.0
+				if (osvi.dwMajorVersion >= 4)
+				{
+					unicodeSupported = true;
+				}
+			}
+		}
+#else
+		unicodeSupported = true;
+#endif
+	}
+	return unicodeSupported;
+}
+
+bool CSystemUtils::isAzertyKeyboard()
+{
+#ifdef NL_OS_WINDOWS
+	uint16 klId = uint16((uint32)GetKeyboardLayout(0) & 0xFFFF);
+	// 0x040c is French, 0x080c is Belgian
+	if (klId == 0x040c || klId == 0x080c)
+		return true;
+#endif
+	return false;
+}
+
+bool CSystemUtils::isScreensaverEnabled()
+{
+	bool res = false;
+#ifdef NL_OS_WINDOWS
+//	old code, is not working anymore
+//	BOOL bRetValue;
+//	SystemParametersInfoA(SPI_GETSCREENSAVEACTIVE, 0, &bRetValue, 0);
+//	res = (bRetValue == TRUE);
+	HKEY hKeyScreenSaver = NULL;
+	LSTATUS lReturn = RegOpenKeyExA(HKEY_CURRENT_USER, TEXT("Control Panel\\Desktop"), 0, KEY_QUERY_VALUE, &hKeyScreenSaver);
+	if (lReturn == ERROR_SUCCESS)
+	{
+		DWORD dwType = 0L;
+		DWORD dwSize = KeyMaxLength;
+		unsigned char Buffer[KeyMaxLength] = {0};
+
+		lReturn = RegQueryValueExA(hKeyScreenSaver, TEXT("SCRNSAVE.EXE"), NULL, &dwType, NULL, &dwSize);
+		// if SCRNSAVE.EXE is present, check also if it's empty
+		if (lReturn == ERROR_SUCCESS)
+			res = (Buffer[0] != '\0');
+	}
+	RegCloseKey(hKeyScreenSaver);
+#endif
+	return res;
+}
+
+bool CSystemUtils::enableScreensaver(bool screensaver)
+{
+	bool res = false;
+#ifdef NL_OS_WINDOWS
+	res = (SystemParametersInfoA(SPI_SETSCREENSAVEACTIVE, screensaver ? TRUE:FALSE, NULL, 0) == TRUE);
+#endif
+	return res;
+}
+
+std::string CSystemUtils::getRootKey()
+{
+	return RootKey;
+}
+
+void CSystemUtils::setRootKey(const std::string &root)
+{
+	RootKey = root;
+}
+
+string CSystemUtils::getRegKey(const string &Entry)
+{
+	string ret;
+#ifdef NL_OS_WINDOWS
+	HKEY hkey;
+
+	if(RegOpenKeyEx(HKEY_CURRENT_USER, RootKey.c_str(), 0, KEY_READ, &hkey) == ERROR_SUCCESS)
+	{
+		DWORD	dwType	= 0L;
+		DWORD	dwSize	= KeyMaxLength;
+		unsigned char	Buffer[KeyMaxLength];
+
+		if(RegQueryValueEx(hkey, Entry.c_str(), NULL, &dwType, Buffer, &dwSize) != ERROR_SUCCESS)
+		{
+			nlwarning("Can't get the reg key '%s'", Entry.c_str());
+		}
+		else
+		{
+			ret = (char*)Buffer;
+		}
+		RegCloseKey(hkey);
+	}
+	else
+	{
+		nlwarning("Can't get the reg key '%s'", Entry.c_str());
+	}
+#endif
+	return ret;
+}
+
+bool CSystemUtils::setRegKey(const string &ValueName, const string &Value)
+{
+	bool res = false;
+#ifdef NL_OS_WINDOWS
+	HKEY hkey;
+	DWORD dwDisp;
+
+	if (RegCreateKeyExA(HKEY_CURRENT_USER, RootKey.c_str(), 0, "", REG_OPTION_NON_VOLATILE, KEY_ALL_ACCESS, NULL, &hkey, &dwDisp) == ERROR_SUCCESS)
+	{
+		if (RegSetValueExA(hkey, ValueName.c_str(), 0L, REG_SZ, (const BYTE *)Value.c_str(), (DWORD)(Value.size())+1) == ERROR_SUCCESS)
+			res = true;
+		RegCloseKey(hkey);
+	}
+	else
+	{
+		nlwarning("Can't set the reg key '%s' '%s'", ValueName.c_str(), Value.c_str());
+	}
+#endif
+
+	return res;
+}
+
+uint CSystemUtils::getCurrentColorDepth()
+{
+	uint depth = 0;
+
+#ifdef NL_OS_WINDOWS
+	HWND desktopWnd = GetDesktopWindow();
+	if (desktopWnd)
+	{
+		HDC desktopDC = GetWindowDC(desktopWnd);
+		if (desktopDC)
+		{
+			depth = (uint) GetDeviceCaps(desktopDC, BITSPIXEL);
+			ReleaseDC(desktopWnd, desktopDC);
+		}
+	}
+#else
+	Display *display = XOpenDisplay(NULL);
+	if (display)
+	{
+		depth = (uint) DefaultDepth(display, DefaultScreen(display));
+		XCloseDisplay(display);
+	}
+#endif
+	return depth;
+}
+
 } // NLMISC
diff --git a/code/ryzom/client/src/connection.cpp b/code/ryzom/client/src/connection.cpp
index 30e8842f3..141b2cff2 100644
--- a/code/ryzom/client/src/connection.cpp
+++ b/code/ryzom/client/src/connection.cpp
@@ -27,6 +27,7 @@
 #include "nel/misc/path.h"
 #include "nel/misc/time_nl.h"
 #include "nel/misc/algo.h"
+#include "nel/misc/system_utils.h"
 // 3D Interface.
 #include "nel/3d/u_driver.h"
 #include "nel/3d/u_text_context.h"
@@ -2394,14 +2395,7 @@ public:
 		}
 
 		// default to 'ZQSD' for French and Belgian keyboard, 'WASD' else
-		bool wasd = true;
-#ifdef NL_OS_WINDOWS
-		uint16 klId = uint16((uint32)GetKeyboardLayout(0) & 0xFFFF);
-		if (klId == 0x040c || klId == 0x080c)
-		{
-			wasd = false;
-		}
-#endif
+		bool wasd = !CSystemUtils::isAzertyKeyboard();
 
 		/*sint startIndex = wasd ? wasdIndex : zqsdIndex;
 		if (startIndex == -1) startIndex = 0;
diff --git a/code/ryzom/client/src/init.cpp b/code/ryzom/client/src/init.cpp
index a41dfca1f..800cdf9a1 100644
--- a/code/ryzom/client/src/init.cpp
+++ b/code/ryzom/client/src/init.cpp
@@ -656,16 +656,11 @@ void prelogInit()
 
 		set_new_handler(outOfMemory);
 
-#ifdef NL_OS_WINDOWS
-		{
-			BOOL bRetValue;
-			SystemParametersInfo (SPI_GETSCREENSAVEACTIVE, 0, &bRetValue, 0);
-			LastScreenSaverEnabled = (bRetValue == TRUE);
-			SystemParametersInfo (SPI_SETSCREENSAVEACTIVE, FALSE, NULL, 0);
-		}
-#else // NL_OS_WINDOWS
-		// Not tested, not compiled
-#endif // NL_OS_WINDOWS
+		// save screen saver state and disable it
+		LastScreenSaverEnabled = CSystemUtils::isScreensaverEnabled();
+
+		if (LastScreenSaverEnabled)
+			CSystemUtils::enableScreensaver(false);
 
 		// Random init
 		srand ((uint)CTime::getLocalTime());
diff --git a/code/ryzom/client/src/interface_v3/group_editbox.cpp b/code/ryzom/client/src/interface_v3/group_editbox.cpp
index 58be769c9..fce01798f 100644
--- a/code/ryzom/client/src/interface_v3/group_editbox.cpp
+++ b/code/ryzom/client/src/interface_v3/group_editbox.cpp
@@ -22,6 +22,7 @@
 #include "interface_manager.h"
 #include "input_handler_manager.h"
 #include "nel/misc/command.h"
+#include "nel/misc/system_utils.h"
 #include "view_text.h"
 #include "game_share/xml_auto_ptr.h"
 #include "interface_options.h"
@@ -335,30 +336,10 @@ void CGroupEditBox::copy()
 		nlwarning("Selection can only be on focus");
 	}
 	stopParentBlink();
-	// get the selection
-	ucstring	selection= getSelection();
 
-	// copy
-	#ifdef NL_OS_WINDOWS
-		if (selection.size() > 0 && OpenClipboard (NULL))
-		{
-			bool isUnicode = IsClipboardFormatAvailable(CF_UNICODETEXT) == TRUE;
-			HGLOBAL mem = GlobalAlloc (GHND|GMEM_DDESHARE, (selection.size()+1) * (isUnicode ? 2:1));
-			if (mem)
-			{
-				void *hLock = GlobalLock (mem);
-				if (isUnicode)
-					wcscpy ((wchar_t*)hLock, (const wchar_t*)selection.c_str());
-				else
-					strcpy ((char*)hLock, selection.toString().c_str());
-				GlobalUnlock (mem);
-				EmptyClipboard ();
-				SetClipboardData (isUnicode ? CF_UNICODETEXT:CF_TEXT, mem);
-			}
-			CloseClipboard ();
-			nlinfo ("Chat input was copied in the clipboard");
-		}
-	#endif // NL_OS_WINDOWS
+	// get the selection and copy it
+	if (CSystemUtils::copyTextToClipboard(getSelection()))
+		nlinfo ("Chat input was copied in the clipboard");
 }
 
 // ----------------------------------------------------------------------------
@@ -374,172 +355,154 @@ void CGroupEditBox::paste()
 	}
 	stopParentBlink();
 	makeTopWindow();
-	#ifdef NL_OS_WINDOWS
-		if (OpenClipboard (NULL))
-		{
-			bool isUnicode = IsClipboardFormatAvailable(CF_UNICODETEXT) == TRUE;
 
-			HANDLE hObj = GetClipboardData(isUnicode ? CF_UNICODETEXT:CF_TEXT);
+	ucstring sString;
 
-			if (hObj)
-			{
-				void *hLock = GlobalLock(hObj);
+	if (CSystemUtils::pasteTextFromClipboard(sString))
+	{
+		sint length = (sint)sString.length();
 
-				if (hLock != NULL)
+		ucstring toAppend;
+		// filter character depending on the netry type
+		switch (_EntryType)
+		{
+			case Text:
+			case Password:
+			{
+				if (_NegativeFilter.empty())
 				{
-					ucstring sString;
-				
-					if (isUnicode)
-						sString = (const ucchar*)hLock;
-					else
-						sString = (const char*)hLock;
-
-					sint length = (sint)sString.length();
-
-					ucstring toAppend;
-					// filter character depending on the netry type
-					switch (_EntryType)
+					toAppend = sString;
+				}
+				else
+				{
+					for (sint k = 0; k < length; ++k)
 					{
-						case Text:
-						case Password:
-						{
-							if (_NegativeFilter.empty())
-							{
-								toAppend = sString;
-							}
-							else
-							{
-								for (sint k = 0; k < length; ++k)
-								{
-									if (!isFiltered(sString[k]))
-									{
-										toAppend += sString[k];
-									}
-								}
-							}
-							// remove '\r' characters
-							toAppend.erase(std::remove(toAppend.begin(), toAppend.end(), (ucchar) '\r'), toAppend.end());
-
-						}
-						break;
-						case PositiveInteger:
-						case PositiveFloat:
+						if (!isFiltered(sString[k]))
 						{
-							for (sint k = 0; k < length; ++k)
-							{
-								if (isdigit(sString[k]) || sString[k]== ' ' ||
-									(_EntryType==PositiveFloat && sString[k]=='.') )
-								{
-									if (!isFiltered(sString[k]))
-									{
-										toAppend += sString[k];
-									}
-								}
-							}
+							toAppend += sString[k];
 						}
-						break;
-						case Integer:
-						case Float:
+					}
+				}
+				// remove '\r' characters
+				toAppend.erase(std::remove(toAppend.begin(), toAppend.end(), (ucchar) '\r'), toAppend.end());
+
+			}
+			break;
+			case PositiveInteger:
+			case PositiveFloat:
+			{
+				for (sint k = 0; k < length; ++k)
+				{
+					if (isdigit(sString[k]) || sString[k]== ' ' ||
+						(_EntryType==PositiveFloat && sString[k]=='.') )
+					{
+						if (!isFiltered(sString[k]))
 						{
-							for (sint k = 0; k < length; ++k)
-							{
-								if (isdigit(sString[k]) || sString[k]== ' ' || sString[k]== '-' ||
-									(_EntryType==Float && sString[k]=='.') )
-								{
-									if (!isFiltered(sString[k]))
-									{
-										toAppend += sString[k];
-									}
-								}
-							}
+							toAppend += sString[k];
 						}
-						break;
-						case AlphaNumSpace:
+					}
+				}
+			}
+			break;
+			case Integer:
+			case Float:
+			{
+				for (sint k = 0; k < length; ++k)
+				{
+					if (isdigit(sString[k]) || sString[k]== ' ' || sString[k]== '-' ||
+						(_EntryType==Float && sString[k]=='.') )
+					{
+						if (!isFiltered(sString[k]))
 						{
-							for (sint k = 0; k < length; ++k)
-							{
-								if (isValidAlphaNumSpace(sString[k]))
-								{
-									if (!isFiltered(sString[k]))
-									{
-										toAppend += sString[k];
-									}
-								}
-							}
+							toAppend += sString[k];
 						}
-						break;
-						case AlphaNum:
+					}
+				}
+			}
+			break;
+			case AlphaNumSpace:
+			{
+				for (sint k = 0; k < length; ++k)
+				{
+					if (isValidAlphaNumSpace(sString[k]))
+					{
+						if (!isFiltered(sString[k]))
 						{
-							for (sint k = 0; k < length; ++k)
-							{
-								if (isValidAlphaNum(sString[k]))
-								{
-									if (!isFiltered(sString[k]))
-									{
-										toAppend += sString[k];
-									}
-								}
-							}
+							toAppend += sString[k];
 						}
-						break;
-						case Alpha:
+					}
+				}
+			}
+			break;
+			case AlphaNum:
+			{
+				for (sint k = 0; k < length; ++k)
+				{
+					if (isValidAlphaNum(sString[k]))
+					{
+						if (!isFiltered(sString[k]))
 						{
-							for (sint k = 0; k < length; ++k)
-							{
-								if (isValidAlpha(sString[k]))
-								{
-									if (!isFiltered(sString[k]))
-									{
-										toAppend += sString[k];
-									}
-								}
-							}
+							toAppend += sString[k];
 						}
-						break;
-						case Filename:
+					}
+				}
+			}
+			break;
+			case Alpha:
+			{
+				for (sint k = 0; k < length; ++k)
+				{
+					if (isValidAlpha(sString[k]))
+					{
+						if (!isFiltered(sString[k]))
 						{
-							for (sint k = 0; k < length; ++k)
-							{
-								if (isValidFilenameChar(sString[k]))
-								{
-									if (!isFiltered(sString[k]))
-									{
-										toAppend += sString[k];
-									}
-								}
-							}
+							toAppend += sString[k];
 						}
-						break;
-						case PlayerName:
+					}
+				}
+			}
+			break;
+			case Filename:
+			{
+				for (sint k = 0; k < length; ++k)
+				{
+					if (isValidFilenameChar(sString[k]))
+					{
+						if (!isFiltered(sString[k]))
 						{
-							for (sint k = 0; k < length; ++k)
-							{
-								if (isValidPlayerNameChar(sString[k]))
-								{
-									if (!isFiltered(sString[k]))
-									{
-										toAppend += sString[k];
-									}
-								}
-							}
+							toAppend += sString[k];
 						}
 					}
-					length = (sint)toAppend.size();
-					if ((uint) (_InputString.length() + length) > _MaxNumChar)
+				}
+			}
+			break;
+			case PlayerName:
+			{
+				for (sint k = 0; k < length; ++k)
+				{
+					if (isValidPlayerNameChar(sString[k]))
 					{
-						length = _MaxNumChar - (sint)_InputString.length();
+						if (!isFiltered(sString[k]))
+						{
+							toAppend += sString[k];
+						}
 					}
-					ucstring toAdd = toAppend.substr(0, length);
-					_InputString = _InputString.substr(0, _CursorPos) + toAdd + _InputString.substr(_CursorPos);
-					_CursorPos += (sint32)toAdd.length();
-					GlobalUnlock (hObj);
-					nlinfo ("Chat input was pasted from the clipboard");
 				}
 			}
-			CloseClipboard ();
-			triggerOnChangeAH();
 		}
-	#endif // NL_OS_WINDOWS
+		length = (sint)toAppend.size();
+		if ((uint) (_InputString.length() + length) > _MaxNumChar)
+		{
+			length = _MaxNumChar - (sint)_InputString.length();
+		}
+		ucstring toAdd = toAppend.substr(0, length);
+		_InputString = _InputString.substr(0, _CursorPos) + toAdd + _InputString.substr(_CursorPos);
+		_CursorPos += (sint32)toAdd.length();
+		nlinfo ("Chat input was pasted from the clipboard");
+
+		triggerOnChangeAH();
+	}
+
 	_CursorAtPreviousLineEnd = false;
 }
 
diff --git a/code/ryzom/client/src/login.cpp b/code/ryzom/client/src/login.cpp
index 0b233bab0..b07fbd061 100644
--- a/code/ryzom/client/src/login.cpp
+++ b/code/ryzom/client/src/login.cpp
@@ -26,9 +26,11 @@
 #include "nel/misc/debug.h"
 #include "nel/misc/path.h"
 #include "nel/misc/thread.h"
+#include "nel/misc/big_file.h"
+#include "nel/misc/system_utils.h"
+
 #include "nel/net/tcp_sock.h"
 #include "nel/3d/u_driver.h"
-#include "nel/misc/big_file.h"
 
 #include "interface_v3/interface_manager.h"
 #include "interface_v3/input_handler_manager.h"
@@ -95,10 +97,6 @@ string	R2BackupPatchURL;
 vector<string>	R2PatchURLs;
 
 
-// Key in registry
-static const string RootKey = "SOFTWARE\\Nevrax\\Ryzom";
-static const uint32 KeyMaxLength = 1024;
-
 #define CTRL_EDITBOX_LOGIN		"ui:login:checkpass:content:eb_login:eb"
 #define CTRL_EDITBOX_PASSWORD	"ui:login:checkpass:content:eb_password:eb"
 #define GROUP_LIST_SHARD		"ui:login:sharddisp:content:shard_list"
@@ -736,7 +734,9 @@ void initLoginScreen()
 
 	ClientApp = ClientCfg.ConfigFile.getVar("Application").asString(0);
 
-	string l = getRegKeyValue("Login").c_str();
+	CSystemUtils::setRootKey("SOFTWARE\\Nevrax\\Ryzom");
+
+	string l = CSystemUtils::getRegKey("Login");
 
 	if(!l.empty())
 	{
@@ -927,60 +927,6 @@ bool login()
 // INTERFACE HELPERS
 // ***************************************************************************
 
-// ***************************************************************************
-string getRegKeyValue(const string &Entry)
-{
-	string ret;
-#ifdef NL_OS_WINDOWS
-	HKEY hkey;
-
-	if(RegOpenKeyEx(HKEY_LOCAL_MACHINE, RootKey.c_str(), 0, KEY_READ, &hkey) == ERROR_SUCCESS)
-	{
-		DWORD	dwType	= 0L;
-		DWORD	dwSize	= KeyMaxLength;
-		unsigned char	Buffer[KeyMaxLength];
-
-		if(RegQueryValueEx(hkey, Entry.c_str(), NULL, &dwType, Buffer, &dwSize) != ERROR_SUCCESS)
-		{
-			nlwarning("Can't get the reg key '%s'", Entry.c_str());
-		}
-		else
-		{
-			ret = (char*)Buffer;
-		}
-		RegCloseKey(hkey);
-	}
-	else
-	{
-		nlwarning("Can't get the reg key '%s'", Entry.c_str());
-	}
-#else
-	// TODO for Linux and Mac OS
-#endif
-	return ret;
-}
-
-// ***************************************************************************
-void setRegKey(const string &ValueName, const string &Value)
-{
-#ifdef NL_OS_WINDOWS
-	HKEY hkey;
-	DWORD dwDisp;
-
-	if(RegCreateKeyEx(HKEY_LOCAL_MACHINE, RootKey.c_str(), 0, "", REG_OPTION_NON_VOLATILE, KEY_ALL_ACCESS, NULL, &hkey, &dwDisp) == ERROR_SUCCESS)
-	{
-		RegSetValueEx(hkey, ValueName.c_str(), 0L, REG_SZ, (const BYTE *)Value.c_str(), (DWORD)(Value.size())+1);
-		RegCloseKey(hkey);
-	}
-	else
-	{
-		nlwarning("Can't set the reg key '%s' '%s'", ValueName.c_str(), Value.c_str());
-	}
-#else
-	// TODO for Linux and Mac OS
-#endif
-}
-
 // ***************************************************************************
 void removeSpace(string &s)
 {
@@ -1162,7 +1108,7 @@ void onlogin(bool vanishScreen = true)
 	removeSpace(LoginPassword);
 
 	if(!LoginLogin.empty())
-		setRegKey("Login", LoginLogin);
+		CSystemUtils::setRegKey("Login", LoginLogin);
 
 	if(vanishScreen)
 		pIM->getDbProp("UI:VARIABLES:SCREEN")->setValue32(-1);
@@ -1836,24 +1782,18 @@ class CAHOpenURL : public IActionHandler
 
 #ifdef NL_OS_WINDOWS
 
-		const LONG BUFFER_LEN = 1024;
-		LONG bufferLenght = BUFFER_LEN;
-		char buffer[BUFFER_LEN];
 		// Check for special install tag
-		const char *KeyName = "Software\\Nevrax\\Ryzom\\InstallTag";
+		const char *KeyName = "InstallTag";
 
-		LONG ret = RegQueryValueA(HKEY_LOCAL_MACHINE, KeyName, buffer, &bufferLenght);
-		if (ret == ERROR_SUCCESS)
-		{
-			if (bufferLenght > 1)
-			{
-				installTag = buffer;
+		installTag = CSystemUtils::getRegKey(KeyName);
 
-				nldebug("Found install tag '%s'", url.c_str());
-			}
+		if (installTag.length() > 1)
+		{
+			nldebug("Found install tag '%s'", url.c_str());
 		}
 		else
 		{
+			DWORD ret = 0;
 			LPVOID lpMsgBuf;
 			FormatMessage(
 				FORMAT_MESSAGE_ALLOCATE_BUFFER |
diff --git a/code/ryzom/client/src/login.h b/code/ryzom/client/src/login.h
index 583e66206..6c5824480 100644
--- a/code/ryzom/client/src/login.h
+++ b/code/ryzom/client/src/login.h
@@ -61,11 +61,6 @@ std::string getBGDownloaderCommandLine();
 bool login();
 void loginIntro();
 
-// helpers
-std::string getRegKeyValue(const std::string &Entry);
-void setRegKey(const std::string &ValueName, const std::string &Value);
-
-
 // force patch for the mainland part
 void mainLandPatch();
 
diff --git a/code/ryzom/client/src/misc.cpp b/code/ryzom/client/src/misc.cpp
index 02b570dd9..34a1e1205 100644
--- a/code/ryzom/client/src/misc.cpp
+++ b/code/ryzom/client/src/misc.cpp
@@ -47,6 +47,7 @@
 #include "nel/misc/fast_floor.h"
 #include "nel/misc/noise_value.h"
 #include "nel/misc/bitmap.h"
+#include "nel/misc/system_utils.h"
 // Game Share
 #include "game_share/player_visual_properties.h"
 #include "game_share/seeds.h"
@@ -1464,26 +1465,7 @@ uint getCurrentColorDepth()
 			return videoMode.Depth;
 		}
 	}
-	uint depth = 0;
-	#ifdef NL_OS_WINDOWS
-		HWND desktopWnd = GetDesktopWindow();
-		if (desktopWnd)
-		{
-			HDC desktopDC = GetWindowDC(desktopWnd);
-			if (desktopDC)
-			{
-				depth = (uint) GetDeviceCaps(desktopDC, BITSPIXEL);
-				ReleaseDC(desktopWnd, desktopDC);
-			}
-		}
-	#else
-		Display *display = XOpenDisplay(NULL);
-		if (display)
-		{
-			depth = (uint) DefaultDepth(display, DefaultScreen(display));
-			XCloseDisplay(display);
-		}
-	#endif
-	return depth;
+
+	return CSystemUtils::getCurrentColorDepth();
 }
 
diff --git a/code/ryzom/client/src/r2/editor.cpp b/code/ryzom/client/src/r2/editor.cpp
index fd53a078d..db355193c 100644
--- a/code/ryzom/client/src/r2/editor.cpp
+++ b/code/ryzom/client/src/r2/editor.cpp
@@ -3028,13 +3028,9 @@ void CEditor::updateSelectingDecals()
 void CEditor::reset()
 {
 	//H_AUTO(R2_CEditor_reset)
-	#ifdef NL_OS_WINDOWS
-		if (ClientCfg.R2EDExtendedDebug)
-		{
-			HWND hWnd = (HWND)Driver->getDisplay ();
-			SetWindowText(hWnd, "Resetting R2ED editor ...");
-		}
-	#endif // NL_OS_WINDOW
+	if (ClientCfg.R2EDExtendedDebug)
+		Driver->setWindowTitle(ucstring("Resetting R2ED editor ..."));
+
 	CHECK_EDITOR
 	_SerializeUIConfig = false; // prevent reloading of ui for speed
 	_WantedActOnInit.clear();
@@ -3077,18 +3073,17 @@ void CEditor::reset()
 	// try to return to the act with the same title
 	_SerializeUIConfig = true;
 
-	#ifdef NL_OS_WINDOWS
-		if (ClientCfg.R2EDExtendedDebug)
-		{
-			HWND hWnd = (HWND)Driver->getDisplay ();
-			nlassert (hWnd);
-			SetWindowTextW (hWnd, (WCHAR*)CI18N::get("TheSagaOfRyzom").c_str ());
-			// Get the window
-			// Show the window
-			ShowWindow (hWnd, SW_SHOW);
-			SetForegroundWindow(hWnd);
-		}
-	#endif
+	if (ClientCfg.R2EDExtendedDebug)
+	{
+		Driver->setWindowTitle(CI18N::get("TheSagaOfRyzom"));
+		Driver->showWindow();
+		// TODO: check
+		// Get the window
+		// Show the window
+//		ShowWindow (hWnd, SW_SHOW);
+//		SetForegroundWindow(hWnd);
+	}
+
 	getUI().displaySystemInfo(CI18N::get("uiR2EDEditorReseted"), "BC");
 }
 
diff --git a/code/ryzom/client/src/release.cpp b/code/ryzom/client/src/release.cpp
index 15ff9b856..1f8f84a3f 100644
--- a/code/ryzom/client/src/release.cpp
+++ b/code/ryzom/client/src/release.cpp
@@ -24,6 +24,7 @@
 // Misc.
 #include "nel/misc/debug.h"
 #include "nel/misc/async_file_manager.h"
+#include "nel/misc/system_utils.h"
 // 3D Interface.
 #include "nel/3d/bloom_effect.h"
 #include "nel/3d/fasthls_modifier.h"
@@ -525,11 +526,8 @@ void release()
 	STRING_MANAGER::CStringManagerClient::instance()->flushStringCache();
 	STRING_MANAGER::CStringManagerClient::release(true);
 
-#ifdef NL_OS_WINDOWS
-	{
-		SystemParametersInfo (SPI_SETSCREENSAVEACTIVE, LastScreenSaverEnabled?TRUE:FALSE, NULL, 0);
-	}
-#endif // NL_OS_WINDOWS
+	// restore screensaver state
+	CSystemUtils::enableScreensaver(LastScreenSaverEnabled);
 
 	// release PACS primitives
 	deletePrimitiveBlocks();