Convert UTF-8 to Unicode problem

[TOMNKZ]

Hi,
i have utf-8 files in utf-8 with arabic characters. I want to convert it to Unicode.
My code:

 
char* data = //arabic text in UTF-8
CString value;
int req = MultiByteToWideChar(CP_UTF8,0,data,-1,NULL,0);
if(req > 0)
{
TCHAR* newData = NULL;
newData = new TCHAR[req];
if(newData!=NULL)
{
	MultiByteToWideChar(CP_UTF8,0,data,-1,newData,req);
	value = newData;
	delete[] newData;
	return 1;
}
else return -1;
}
else
{
DWORD err = GetLastError();
return -1;
}

Why instead of arabic symbols i get '?' ?