visual basic clipboard with html format not working for non utf characters

I am using Visual Basic automation for powerpoint, to render html formatting to textbox i used the below clipboard rendering method and it works fine except for non UTF characters. Please help!!

        CopyMemory ByVal lpData, ByVal sData, Len(sData)
        GlobalUnlock hMemHandle
        EmptyClipboard
        SetClipboardData m_cfHTMLClipFormat, hMemHandle