I think that was NT 4. I don’t think there’s much of that 20-year old code left in the kernel.
I'd actually be surprised if there weren't quite a bit of it still in the kernel.
Actually given the horror stories that have been told about the windows source code over the years, I'd be very, very surprised if there wasn't 20 year old code in a lot of places.
Hell there's still 20 year old code running in the Linux kernel
The source code of the kernel of Windows server 2003 and Windows XP Pro x64 was available to universities for education purposes. Someone leaked the code on internet years ago which is now everywhere on github (search WRK-v1.2). The code doesn't include the ntfs module.