Rich edit controls: If this parameter is zero, the text length is set to 64,000 characters. Edit controls on Windows NT/2000/XP: If this parameter is zero, the text length is set to 0x7FFFFFFE characters for single-line edit controls or ?1 for multiline edit controls. Edit controls on Windows 95/98/Me: If this parameter is zero, the text length is set to 0x7FFE characters for single-line edit controls or 0xFFFF for multiline edit controls.