I've run the command window successfully, I typed the command following your example.
XRayBuilder.exe -s
http://www.shelfari.com/books/11106/A-Feast-for-Crows "C:\Users\Zura\Desktop\Martin, George R. R_\Feast For Crows, A\Feast For Crows, A - George R. R.Martin.mobi" -a C:\Users\Zura\Desktop\2
And I got this