The fair question is why in 2018 someone might want to deal with Windows NT and vulnerabilities in it. Now Windows NT is a great analogue of DVWA (Damn Vulnerable Web Application), but for operating systems. There are a lot of well-described vulnerabilities with ready-made exploits. A great tool for practising.
Well, despite the fact that this operating system is not supported since 2004, it can be used in some weird legacy systems. 😉