diff --git a/code/nel/include/nel/misc/sheet_id.h b/code/nel/include/nel/misc/sheet_id.h
index 9c13b6189..869a61af6 100644
--- a/code/nel/include/nel/misc/sheet_id.h
+++ b/code/nel/include/nel/misc/sheet_id.h
@@ -60,6 +60,12 @@ public :
 	 */
 	explicit CSheetId( const std::string& sheetName );
 
+	/**
+	 * Constructor, uses defaultType as extension when sheetName
+	 * contains no file extension.
+	 */
+	explicit CSheetId( const std::string& sheetName, const std::string &defaultType );
+
 	// build from a string and returns true if the build succeed
 	bool	 buildSheetId(const std::string& sheetName);
 
diff --git a/code/nel/src/misc/sheet_id.cpp b/code/nel/src/misc/sheet_id.cpp
index 28d6498b0..e76f66656 100644
--- a/code/nel/src/misc/sheet_id.cpp
+++ b/code/nel/src/misc/sheet_id.cpp
@@ -106,6 +106,14 @@ CSheetId::CSheetId( const string& sheetName )
 
 } // CSheetId //
 
+CSheetId::CSheetId( const std::string& sheetName, const std::string &defaultType )
+{
+	if (CFile::getExtension(sheetName) == "" && defaultType != "")
+		*this = CSheetId(sheetName + "." + defaultType);
+	else
+		*this = CSheetId(sheetName);
+}
+
 
 //-----------------------------------------------
 //	Build
@@ -522,16 +530,7 @@ void CSheetId::serialString(NLMISC::IStream &f, const std::string &defaultType)
 	{
 		std::string sheetName;
 		f.serial(sheetName);
-		if (CFile::getExtension(sheetName) == "" && defaultType != "")
-			sheetName += std::string(".") + defaultType;
-		if (!buildSheetId(sheetName))
-		{
-			if(sheetName.empty())
-				nlwarning("SHEETID: Try to create an CSheetId with empty name. TODO: check why.");
-			else
-				nlwarning("SHEETID: The sheet '%s' is not in sheet_id.bin, setting it to Unknown",sheetName.c_str());
-			*this = Unknown;
-		}
+		*this = CSheetId(sheetName, defaultType);
 	}
 	else
 	{