Rawrite32

Rawrite32 is a tool to prepare disks or other removeable media, especially USB memory sticks, from files called file system images.

These images are usualy prepared with a NetBSD system already setup or downloaded from the official release (or NetBSD-daily snapshot server) and are utilized in various ways (depending on the port of NetBSD) to bootstrap a new installation.
You can download the file system images via the internet and move the contents onto appropriate media for your machine using this utility program.
Rawrite32 runs on any kind of Win32 system, but on ancient systems (Windows 95 upto Windows ME) has some restrictions.