Hi, we can use the following registrykey HKEY_LOCAL_MACHINE\ System\CurrentControlSet\Control\NLS\CodePage\EUDCCodeRange to get the correct key range and also for correct implementation of ismbblead in msvcrt its documented here http://msdn.microsoft.com/library/default.asp?url=/library/en-us/intl/unicode_3rfp.asp Thanks, Vijay