woeusb
Windows media creation tool.
TLDR
Format a USB then create a bootable Windows installation drive
$ woeusb --device [path/to/windows.iso] [/dev/sdX]
Copy Windows files to an existing partition of a USB storage device and make it bootable, without erasing the current data
$ woeusb --partition [path/to/windows.iso] [/dev/sdXN]