diff --git a/code/ryzom/client/src/3d_notes.cpp b/code/ryzom/client/src/3d_notes.cpp
index 618525de4..c53ac7ef1 100644
--- a/code/ryzom/client/src/3d_notes.cpp
+++ b/code/ryzom/client/src/3d_notes.cpp
@@ -280,11 +280,11 @@ NLMISC_COMMAND(gotoNote, "go to a note", "<id>|<text>")
 			if(i != 0) tok += " ";
 			tok += args[i];
 		}
-		tok = strlwr(tok);
+		tok = toLower(tok);
 		list<C3DNotes::CNote>::iterator it;
 		for(it = Notes.Notes.begin(); it != Notes.Notes.end(); it++)
 		{
-			string note = strlwr((*it).Note);
+			string note = toLower((*it).Note);
 			if(note.find(tok) != string::npos)
 			{
 				pos = (*it).Position;
diff --git a/code/ryzom/client/src/animation_fx_sheet.cpp b/code/ryzom/client/src/animation_fx_sheet.cpp
index 99175ad71..b5c778b11 100644
--- a/code/ryzom/client/src/animation_fx_sheet.cpp
+++ b/code/ryzom/client/src/animation_fx_sheet.cpp
@@ -64,8 +64,7 @@ void CAnimationFX::buildTrack(NL3D::UAnimationSet *as)
 	nlassert(Sheet != NULL);
 	if (!as) return;
 	if (Sheet->TrajectoryAnim.empty()) return;
-	std::string animName = Sheet->TrajectoryAnim;
-	NLMISC::strlwr(animName);
+	std::string animName = NLMISC::toLower(Sheet->TrajectoryAnim);
 	uint id = as->getAnimationIdByName(animName);
 	NL3D::UAnimation *anim = NULL;
 	if (id != NL3D::UAnimationSet::NotFound)
diff --git a/code/ryzom/client/src/client_sheets/automaton_list_sheet.cpp b/code/ryzom/client/src/client_sheets/automaton_list_sheet.cpp
index fe7cd002c..1f0b6565c 100644
--- a/code/ryzom/client/src/client_sheets/automaton_list_sheet.cpp
+++ b/code/ryzom/client/src/client_sheets/automaton_list_sheet.cpp
@@ -204,7 +204,7 @@ void CAutomatonStateSheet::build(const NLGEORGES::UFormElm &item, const string &
 	for(uint mode = 0; mode<MBEHAV::NUMBER_OF_MODES; ++mode)
 	{
 		string animset;
-		animset = NLMISC::strlwr(MBEHAV::modeToString((MBEHAV::EMode)mode));
+		animset = NLMISC::toLower(MBEHAV::modeToString((MBEHAV::EMode)mode));
 		if(animset != "unknown_mode")
 		{
 			string resultTransition;
@@ -495,9 +495,9 @@ void CAutomatonListSheet::build(const NLGEORGES::UFormElm &rootList)
 				for(uint mode = 0; mode<MBEHAV::NUMBER_OF_MODES; ++mode)
 				{
 					// Get the Mode Name
-					string modeName = NLMISC::strlwr(MBEHAV::modeToString((MBEHAV::EMode)mode));
+					string modeName = NLMISC::toLower(MBEHAV::modeToString((MBEHAV::EMode)mode));
 					// Compute the automaton name
-					string filename = NLMISC::strlwr(automatonType) + "_" + modeName + ".automaton";
+					string filename = NLMISC::toLower(automatonType) + "_" + modeName + ".automaton";
 					// Push some information
 					nlinfo("loading automaton '%s'.", filename.c_str());
 					// Load the automaton's form.
diff --git a/code/ryzom/client/src/client_sheets/character_sheet.cpp b/code/ryzom/client/src/client_sheets/character_sheet.cpp
index f36aa88f4..0da928768 100644
--- a/code/ryzom/client/src/client_sheets/character_sheet.cpp
+++ b/code/ryzom/client/src/client_sheets/character_sheet.cpp
@@ -126,7 +126,7 @@ void CCharacterSheet::readEquipment(const NLGEORGES::UFormElm &form, const strin
 	string itemName;
 	if(!form.getValueByName(itemName, string(key + ".Item").c_str() ))
 		debug(NLMISC::toString("Key '%s.Item' not found.", key.c_str()));
-	slot.IdItem = ClientSheetsStrings.add(NLMISC::strlwr(itemName));
+	slot.IdItem = ClientSheetsStrings.add(NLMISC::toLower(itemName));
 
 	// Get the texture.
 	if(!form.getValueByName(slot.Texture, string(key + ".Texture").c_str() ))
@@ -221,7 +221,7 @@ void CCharacterSheet::build(const NLGEORGES::UFormElm &item)
 		if(AnimSetBaseName.empty())
 			debug("AnimSetBaseName is Empty.");
 		else
-			NLMISC::strlwr(AnimSetBaseName); // Force the CASE in UPPER to not be CASE SENSITIVE.
+			AnimSetBaseName = NLMISC::toLower(AnimSetBaseName); // Force the CASE in UPPER to not be CASE SENSITIVE.
 	}
 	else
 		debug("Key '3d data.AnimSetBaseName' not found.");
@@ -235,7 +235,7 @@ void CCharacterSheet::build(const NLGEORGES::UFormElm &item)
 			debug("Automaton is Empty.");
 		// Lower Case
 		else
-			NLMISC::strlwr(Automaton);
+			Automaton = NLMISC::toLower(Automaton);
 	}
 	// Key not Found
 	else
diff --git a/code/ryzom/client/src/client_sheets/item_sheet.cpp b/code/ryzom/client/src/client_sheets/item_sheet.cpp
index 1e7894b79..afc2f6413 100644
--- a/code/ryzom/client/src/client_sheets/item_sheet.cpp
+++ b/code/ryzom/client/src/client_sheets/item_sheet.cpp
@@ -177,28 +177,28 @@ void CItemSheet::build(const NLGEORGES::UFormElm &item)
 	string IconMain;
 	if(!item.getValueByName (IconMain, "3d.icon"))
 		debug("key '3d.icon' not found.");
-	IconMain = strlwr (IconMain);
+	IconMain = toLower(IconMain);
 	IdIconMain = ClientSheetsStrings.add(IconMain);
 
 	// Get the icon associated.
 	string IconBack;
 	if(!item.getValueByName (IconBack, "3d.icon background"))
 		debug("key '3d.icon background' not found.");
-	IconBack = strlwr (IconBack);
+	IconBack = toLower(IconBack);
 	IdIconBack = ClientSheetsStrings.add(IconBack);
 
 	// Get the icon associated.
 	string IconOver;
 	if(!item.getValueByName (IconOver, "3d.icon overlay"))
 		debug("key '3d.icon overlay' not found.");
-	IconOver = strlwr (IconOver);
+	IconOver = toLower(IconOver);
 	IdIconOver = ClientSheetsStrings.add(IconOver);
 
 	// Get the icon associated.
 	string IconOver2;
 	if(!item.getValueByName (IconOver2, "3d.icon overlay2"))
 		debug("key '3d.icon overlay2' not found.");
-	IconOver2 = strlwr (IconOver2);
+	IconOver2 = toLower(IconOver2);
 	IdIconOver2 = ClientSheetsStrings.add(IconOver2);
 
 	// Get Special modulate colors
@@ -211,7 +211,7 @@ void CItemSheet::build(const NLGEORGES::UFormElm &item)
 	string IconText;
 	if(!item.getValueByName (IconText, "3d.text overlay"))
 		debug("key '3d.text overlay' not found.");
-	IconText = strlwr (IconText);
+	IconText = toLower(IconText);
 	IdIconText = ClientSheetsStrings.add(IconText);
 
 	// See if this item can be hiden when equipped
@@ -303,7 +303,7 @@ void CItemSheet::build(const NLGEORGES::UFormElm &item)
 		debug("key '3d.anim_set' not found.");
 	// Force the CASE in UPPER to not be CASE SENSITIVE.
 	else
-		NLMISC::strlwr(AnimSet);
+		AnimSet = NLMISC::toLower(AnimSet);
 	IdAnimSet = ClientSheetsStrings.add(AnimSet);
 
 	// Get the Trail Shape
@@ -318,28 +318,28 @@ void CItemSheet::build(const NLGEORGES::UFormElm &item)
 	string Effect1;
 	if(!item.getValueByName(Effect1, "Effects.Effect1"))
 		debug("key 'Effects.Effect1' not found.");
-	Effect1 = strlwr(Effect1);
+	Effect1 = toLower(Effect1);
 	IdEffect1 = ClientSheetsStrings.add(Effect1);
 
 	// Get special Effect2
 	string Effect2;
 	if(!item.getValueByName(Effect2, "Effects.Effect2"))
 		debug("key 'Effects.Effect2' not found.");
-	Effect2 = strlwr(Effect2);
+	Effect2 = toLower(Effect2);
 	IdEffect2 = ClientSheetsStrings.add(Effect2);
 
 	// Get special Effect3
 	string Effect3;
 	if(!item.getValueByName(Effect3, "Effects.Effect3"))
 		debug("key 'Effects.Effect3' not found.");
-	Effect3 = strlwr(Effect3);
+	Effect3 = toLower(Effect3);
 	IdEffect3 = ClientSheetsStrings.add(Effect3);
 
 	// Get special Effect4
 	string Effect4;
 	if(!item.getValueByName(Effect4, "Effects.Effect4"))
 		debug("key 'Effects.Effect4' not found.");
-	Effect4 = strlwr(Effect4);
+	Effect4 = toLower(Effect4);
 	IdEffect4 = ClientSheetsStrings.add(Effect4);
 
 	// Get its bulk
diff --git a/code/ryzom/client/src/client_sheets/outpost_building_sheet.cpp b/code/ryzom/client/src/client_sheets/outpost_building_sheet.cpp
index 8951225ed..8c8f3ea8c 100644
--- a/code/ryzom/client/src/client_sheets/outpost_building_sheet.cpp
+++ b/code/ryzom/client/src/client_sheets/outpost_building_sheet.cpp
@@ -110,28 +110,28 @@ void COutpostBuildingSheet::build(const NLGEORGES::UFormElm &root)
 	string IconMain;
 	if(!root.getValueByName (IconMain, "icon"))
 		debug("key 'icon' not found.");
-	IconMain = strlwr (IconMain);
+	IconMain = toLower(IconMain);
 	IdIconMain = ClientSheetsStrings.add(IconMain);
 
 	// Get the icon associated.
 	string IconBack;
 	if(!root.getValueByName (IconBack, "icon background"))
 		debug("key 'icon background' not found.");
-	IconBack = strlwr (IconBack);
+	IconBack = toLower(IconBack);
 	IdIconBack = ClientSheetsStrings.add(IconBack);
 
 	// Get the icon associated.
 	string IconOver;
 	if(!root.getValueByName (IconOver, "icon overlay"))
 		debug("key 'icon overlay' not found.");
-	IconOver = strlwr (IconOver);
+	IconOver = toLower(IconOver);
 	IdIconOver = ClientSheetsStrings.add(IconOver);
 
 	// Get the icon text associated.
 	string IconText;
 	if(!root.getValueByName (IconText, "text overlay"))
 		debug("key 'text overlay' not found.");
-	IconText = strlwr (IconText);
+	IconText = toLower(IconText);
 	IdIconText = ClientSheetsStrings.add(IconText);
 }
 
diff --git a/code/ryzom/client/src/client_sheets/player_sheet.cpp b/code/ryzom/client/src/client_sheets/player_sheet.cpp
index 0057d99a0..32d080cb3 100644
--- a/code/ryzom/client/src/client_sheets/player_sheet.cpp
+++ b/code/ryzom/client/src/client_sheets/player_sheet.cpp
@@ -74,7 +74,7 @@ void CPlayerSheet::build(const NLGEORGES::UFormElm &item)
 		debug("Key 'AnimSetBaseName' not found.");
 	// Force the CASE in UPPER to not be CASE SENSITIVE.
 	else
-		NLMISC::strlwr(AnimSetBaseName);
+		AnimSetBaseName = NLMISC::toLower(AnimSetBaseName);
 
 	// Load Lod character name
 	if(!item.getValueByName(LodCharacterName, "LodCharacterName"))
@@ -240,7 +240,7 @@ void CPlayerSheet::CEquipment::build(const std::string &key,const NLGEORGES::UFo
 	if(!item.getValueByName(itemName, string(key + ".Item").c_str() ))
 		debug(NLMISC::toString("Key '%s.Item' not found.", key.c_str()));
 	else
-		Item = NLMISC::strlwr(itemName);
+		Item = NLMISC::toLower(itemName);
 
 	// Get the color.
 	if(!item.getValueByName(Color, string(key + ".Color").c_str() ))
diff --git a/code/ryzom/client/src/client_sheets/sbrick_sheet.cpp b/code/ryzom/client/src/client_sheets/sbrick_sheet.cpp
index 4d5901358..c60d1c03c 100644
--- a/code/ryzom/client/src/client_sheets/sbrick_sheet.cpp
+++ b/code/ryzom/client/src/client_sheets/sbrick_sheet.cpp
@@ -113,22 +113,22 @@ void CSBrickSheet::build (const NLGEORGES::UFormElm &root)
 	// read icons
 	string Icon;
 	root.getValueByName (Icon, "Client.Icon" );
-	Icon = strlwr(Icon);
+	Icon = toLower(Icon);
 	IdIcon = ClientSheetsStrings.add(Icon);
 
 	string IconBack;
 	root.getValueByName (IconBack, "Client.IconBack" );
-	IconBack = strlwr(IconBack);
+	IconBack = toLower(IconBack);
 	IdIconBack = ClientSheetsStrings.add(IconBack);
 
 	string IconOver;
 	root.getValueByName (IconOver, "Client.IconOver" );
-	IconOver = strlwr(IconOver);
+	IconOver = toLower(IconOver);
 	IdIconOver = ClientSheetsStrings.add(IconOver);
 
 	string IconOver2;
 	root.getValueByName (IconOver2, "Client.IconOver2" );
-	IconOver2 = strlwr(IconOver2);
+	IconOver2 = toLower(IconOver2);
 	IdIconOver2 = ClientSheetsStrings.add(IconOver2);
 
 	root.getValueByName (IconColor, "Client.IconColor" );
@@ -381,8 +381,7 @@ void CSBrickSheet::build (const NLGEORGES::UFormElm &root)
 	for(i=0;i<listBrick.size();i++)
 	{
 		CSheetId	sheetId;
-		string	str= listBrick[i];
-		strlwr(str);
+		string	str= toLower(listBrick[i]);
 		if(str.find(".sbrick")==string::npos)
 			str+= ".sbrick";
 		sheetId.buildSheetId(str);
diff --git a/code/ryzom/client/src/commands.cpp b/code/ryzom/client/src/commands.cpp
index 754dec7d7..f958869f5 100644
--- a/code/ryzom/client/src/commands.cpp
+++ b/code/ryzom/client/src/commands.cpp
@@ -1326,7 +1326,7 @@ NLMISC_COMMAND(ah, "Launch an action handler", "<ActionHandler> <AHparam>")
 	if (args.size() == 0)
 		return false;
 
-	if (!ClientCfg.AllowDebugLua && strlwr(args[0]) == "lua")
+	if (!ClientCfg.AllowDebugLua && toLower(args[0]) == "lua")
 	{
 		return false; // not allowed!!
 	}
@@ -1883,7 +1883,7 @@ NLMISC_COMMAND(pos, "Change the position of the user (in local only)", "<x, y, (
 	if(args.size() == 1)
 	{
 		string dest = args[0];
-		newPos = CTeleport::getPos(NLMISC::strlwr(dest));
+		newPos = CTeleport::getPos(NLMISC::toLower(dest));
 		if(newPos == CTeleport::Unknown)
 		{
 			//here we try to teleport to a bot destination
diff --git a/code/ryzom/client/src/interface_v3/sphrase_manager.cpp b/code/ryzom/client/src/interface_v3/sphrase_manager.cpp
index c7e5e380b..0b96f77a3 100644
--- a/code/ryzom/client/src/interface_v3/sphrase_manager.cpp
+++ b/code/ryzom/client/src/interface_v3/sphrase_manager.cpp
@@ -3834,7 +3834,7 @@ void				CSPhraseManager::computePhraseProgression()
 			pse.Text= STRING_MANAGER::CStringManagerClient::getSPhraseLocalizedName(CSheetId(pse.ProgressInfo.SheetId));
 			// avoid mutliple sapce problem
 			strFindReplace(pse.Text, " ", "");
-			// replace each number with 001 format. strlwr
+			// replace each number with 001 format. toLower
 			for(uint k=0;k<pse.Text.size();k++)
 			{
 				if(pse.Text[k] < 256 && isalpha(pse.Text[k]))
diff --git a/code/ryzom/client/src/teleport.cpp b/code/ryzom/client/src/teleport.cpp
index f5ec933a7..c85c938fa 100644
--- a/code/ryzom/client/src/teleport.cpp
+++ b/code/ryzom/client/src/teleport.cpp
@@ -97,16 +97,14 @@ void CTeleport::load(const std::string &/* filename */)
 				string destName;
 				if(tpElmt->getValueByName(destName, "name"))
 				{
-					// All in UPPER CASE to not be CASE SENSITIVE.
-					NLMISC::strlwr(destName);
-
 					// Get the position
 					CVector pos;
 					if(tpElmt->getValueByName(pos.x, "position.X")
 					&& tpElmt->getValueByName(pos.y, "position.Y")
 					&& tpElmt->getValueByName(pos.z, "position.Z"))
 					{
-						_Destinations.insert(make_pair(destName, pos));
+						// All in UPPER CASE to not be CASE SENSITIVE.
+						_Destinations.insert(make_pair(NLMISC::toLower(destName), pos));
 					}
 					else
 						nlwarning("CTeleport::load: Cannot find the one of the key 'position.X or Y or Z' for the element %d.", i);