After extensive reading and research, I have come to a similar conclusion as TheTechRobo that there is no nice easy way to write a M$Windows bootable usb disk in linux. The challenges go even go further when dealing with the newer Win10 whose size is greater than 4GB , a known limit of FAT32 system.
The most reliable method is going bare knuckles with the command line , in a multi step process with a number of disparate CLI tools to creat the boottable medium on the USB.
Windoz doesnot make it easier by preferring DVD/CD based installation media over USB types probably because of the financial harvest they get from selling the OS on CD
The next best Windoz USB bootcreater on linux currently is the Unetbootin application, but its a hit and miss affair with it's own teething problems on a number of linux distros.
There is then an assortment of uninspiringly named linux based bootable USB creaters, the best of which is Woeusb a tool whose development seemed to have stopped 2 years ago
