Comparison of Microsoft Windows versions Technical information Windows NT

| Name_ | Architecture | USB_support | LFN_support | APIs |
|---|---|---|---|---|
| Windows NT 3.1 | 32-bit | No | Yes ( NTFS and HPFS volumes only) | Win32, OS/2 , POSIX |
| Windows NT 3.5 | 32-bit | No | Yes (except on CDFS volumes) | Win32, OS/2, POSIX |
| Windows NT 3.51 | 32-bit | No | Yes (except on CDFS volumes) | Win32, OS/2, POSIX |
| Windows NT 4.0 | 32-bit | Yes (if the Ion USB update is installed) | Yes | Win32, OS/2, POSIX |
| Windows 2000 | 32/64-bit | Yes (USB 2.0 with update or SP4) | Yes | Win32, OS/2, POSIX |
| Windows XP | 32/64-bit | Yes (USB 2.0 with update or SP1+) | Yes | Win32, .NET |
| Windows Server 2003 | 32/64-bit | Yes (USB 2.0) | Yes | Win32 |