WinSetupFromUSB (credit to ilko_t, msfn) is a free utility that can be used to prepare a USB flash drive for Windows setup or other boot options. The software can take Windows setup files as its source and create a bootable USB key.
Can I use WinSetupFromUSB to create a bootable USB drive for Mac OS? No, the app only supports creating bootable USB drives for Windows and Linux-based operating systems.