Run followinf commands as root:
Create emtpy floppy image in your home folder
># dd bs=512 count=2880 \ if=/dev/zero of=~/floppy.img \ mkfs.msdos ~/floppy.img
Mount the image to /media/floppy
># mkdir /media/floppy mount -o loop \ ~/floppy.img /media/floppy
Download autounattend.xml file from https://raw.github.com/stackforge/murano-deployment/master/image-builder/share/files/ws-2012-std/autounattend.xml
># cd ~ ># wget https://raw.github.com/stackforge/murano-deployment\ /master/image-builder/share/files/ws-2012-std/autounattend.xml
Copy our autounattend.xml to /media/floppy
># cp ~/autounattend.xml /media/floppy
Unmount the image
># umount /media/floppy