macOS High Sierra: Create Windows bootable Usb
This can be done by console for Windows 10 iso images (Not sure about 8/7, but leave any comment if it worked for you).
Start connecting your usb drive and type diskutil list to display all connected drives.
You'll see something like:
/dev/disk0 (internal):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                         500.3 GB   disk0
   1:                        EFI EFI                     314.6 MB   disk0s1
   2:                 Apple_APFS Container disk1         500.0 GB   disk0s2

/dev/disk1 (synthesized):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      APFS Container Scheme -                      +500.0 GB   disk1
                                 Physical Store disk0s2
   1:                APFS Volume Macintosh HD            185.7 GB   disk1s1
   2:                APFS Volume Preboot                 47.1 MB    disk1s2
   3:                APFS Volume Recovery                512.8 MB   disk1s3
   4:                APFS Volume VM                      4.3 GB     disk1s4

/dev/disk2 (external, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:     FDisk_partition_scheme                        *15.6 GB    disk2
   1:                 DOS_FAT_32 LALA                    15.6 GB    disk2s1

For my case, the usb drive was /dev/disk2. Knowing this, format your usb drive with:
diskutil eraseDisk MS-DOS &quot;WINDOWS10&quot; MBR disk2

where disk2 is the usb drive id known in the prior command and &quot;WINDOWS10&quot; is the volume label (to be used later).
Please double check this step, or you could delete all data in another drive.
Then mount your image with:
hdiutil mount your_windows_10_image.iso

the command will return the location of the mounted iso
/dev/disk3                                      /Volumes/CPRA_X64FREV_ES-MX_DV5

so finally copy all the files from the mounted iso to your usb drive:
cp -rpv /Volumes/CPRA_X64FREV_ES-MX_DV5/* /Volumes/WINDOWS10