Why is some functionality only supported in Windows NT?
Windows 9x: n. 32 bit extensions and a graphical shell for a 16 bit patch to an 8 bit operating system originally coded for a 4 bit microprocessor, written by a 2 bit company that can’t stand 1 bit of competition. But seriously, Windows 9x lacks most of the security-related calls and has several other deficiencies with respect to its version of the Win32 API. See the calls.texinfo document for more information as to what is not supported in Win 9x.