NT, Windows NT Startup File (.nt)
The NT System file format
Files of the NT format have been introduced to computers and other devices running on Windows NT. They are system files used for the system boot process from Windows NT, 2000 and XP. Thus, they should not be found on computers and devices that run on other operating systems such as Linux and Apple. NT files are also known as Subsystem Startup Files. They might still be used in Windows 7, 8 and 10 installations for 16-bit applications.
Technical details of NT files
NT files contain different instances of settings as well as scripts. These data contained in the files are used by the Windows operating system to load different resources. The NT files should never be manually modified, deleted or moved to another location or directory. This could potentially cause a severe issue during the startup of the computer.