What is the new Windows 2000 SCSI Programming Interface?

I have a lot of Visual-C++-written Windows 9x software that makes use of the Advanced SCSI Programming Interface (WNASPI32.DLL).

I noticed that this interface is no longer present under Windows 2000. Could anybody tell me how to rewrite/port my Windows 9x programs to Windows 2000?

By the way, what is the replacement of WNASPI32.DLL under Windows 2000? And what is now the new Windows 2000 SCSI Programming Interface?

Thanks in advance your your help.