Snow Leopard installer ISO on USB flash drive

Snow Leopard installer ISO on USB flash drive

I have the setup ISO file for my Mac OS X Snow Leopard. I need to be able
to boot this and install it to a USB drive (from a windows pc by booting
the USB drive).
I can't run it in a virtual environment and I can't burn it to a DVD (it
doesn't work for some reason. It only makes a ~120KB of data on the DVD).
So, I need to make a bootable USB installer from the Snow Leopard ISO so I
can boot that and install it to another USB/hard drive (this has to be
done from a windows machine). I have tried Multiboot ISO but it requires
the USB to be formatted as FAT32 and as the ISO is over 4GB, this won't
work.
How can I create the bootable installer?