diff --git a/code/nel/src/3d/driver/direct3d/driver_direct3d.cpp b/code/nel/src/3d/driver/direct3d/driver_direct3d.cpp
index 43d33d081..ce63ce2cd 100644
--- a/code/nel/src/3d/driver/direct3d/driver_direct3d.cpp
+++ b/code/nel/src/3d/driver/direct3d/driver_direct3d.cpp
@@ -1247,23 +1247,23 @@ bool CDriverD3D::init (uintptr_t windowIcon, emptyProc exitFunc)
 
 	createCursors();
 
-	_WindowClass = "NLD3D" + toString(windowIcon);
+	_WindowClass = utf8ToWide("NLD3D" + toString(windowIcon));
 
 	// Register a window class
-	WNDCLASSA		wc;
+	WNDCLASSW		wc;
 
 	memset(&wc,0,sizeof(wc));
 	wc.style			= 0; // CS_HREDRAW | CS_VREDRAW ;//| CS_DBLCLKS;
 	wc.lpfnWndProc		= (WNDPROC)WndProc;
 	wc.cbClsExtra		= 0;
 	wc.cbWndExtra		= 0;
-	wc.hInstance		= GetModuleHandleA(NULL);
+	wc.hInstance		= GetModuleHandleW(NULL);
 	wc.hIcon			= (HICON)windowIcon;
 	wc.hCursor			= _DefaultCursor;
 	wc.hbrBackground	= WHITE_BRUSH;
 	wc.lpszClassName	= _WindowClass.c_str();
 	wc.lpszMenuName		= NULL;
-	if (!RegisterClassA(&wc))
+	if (!RegisterClassW(&wc))
 	{
 		DWORD error = GetLastError();
 		if (error != ERROR_CLASS_ALREADY_EXISTS)
@@ -1416,8 +1416,7 @@ bool CDriverD3D::setDisplay(nlWindow wnd, const GfxMode& mode, bool show, bool r
 		AdjustWindowRect(&WndRect,WndFlags,FALSE);
 
 		// Create
-		ucstring ustr(_WindowClass);
-		_HWnd = CreateWindowW((LPCWSTR)ustr.c_str(), L"", WndFlags, CW_USEDEFAULT,CW_USEDEFAULT, WndRect.right-WndRect.left,WndRect.bottom-WndRect.top, NULL, NULL,
+		_HWnd = CreateWindowW(_WindowClass.c_str(), L"", WndFlags, CW_USEDEFAULT,CW_USEDEFAULT, WndRect.right-WndRect.left,WndRect.bottom-WndRect.top, NULL, NULL,
 			GetModuleHandleW(NULL), NULL);
 		if (!_HWnd)
 		{
diff --git a/code/nel/src/3d/driver/direct3d/driver_direct3d.h b/code/nel/src/3d/driver/direct3d/driver_direct3d.h
index 51c21bbc9..8b17fa28b 100644
--- a/code/nel/src/3d/driver/direct3d/driver_direct3d.h
+++ b/code/nel/src/3d/driver/direct3d/driver_direct3d.h
@@ -2314,7 +2314,7 @@ private:
 	TShaderDrvInfoPtrList	_ShaderDrvInfos;
 
 	// Windows
-	std::string				_WindowClass;
+	std::wstring			_WindowClass;
 	HWND					_HWnd;
 	sint32					_WindowX;
 	sint32					_WindowY;
diff --git a/code/nel/src/3d/driver/opengl/driver_opengl_window.cpp b/code/nel/src/3d/driver/opengl/driver_opengl_window.cpp
index 2e0f2e7a5..6120ecd4c 100644
--- a/code/nel/src/3d/driver/opengl/driver_opengl_window.cpp
+++ b/code/nel/src/3d/driver/opengl/driver_opengl_window.cpp
@@ -316,7 +316,7 @@ bool CDriverGL::init (uintptr_t windowIcon, emptyProc exitFunc)
 		wc.lpfnWndProc		= (WNDPROC)WndProc;
 		wc.cbClsExtra		= 0;
 		wc.cbWndExtra		= 0;
-		wc.hInstance		= GetModuleHandle(NULL);
+		wc.hInstance		= GetModuleHandleW(NULL);
 		wc.hIcon			= (HICON)windowIcon;
 		wc.hCursor			= _DefaultCursor;
 		wc.hbrBackground	= WHITE_BRUSH;