Xorriso command fail when using option -add

Im using Xorriso and running this command : $MKISOFS \ -iso-level 3 \ -J -joliet-long \ -append_partition 2 0xef $UNIONDIR/$EFIIMG \ -partition_cyl_align all \ -add "$UNATTENDED_FILE" 'C:\System32\Sysprep' \ -o "$CFG_ISOPATH" \ "$UNIONDIR/" the command with populated vars is this : /usr/bin/xorriso -as mkisofs -iso-level 3 -J -joliet-long -append_partition 2 0xef /tmp/union.19/boot-efi.img -partition_cyl_align all -add /tmp/wf_script-Xjc2i3/unattended.xml | 'C:\System32\Sysprep' -o 991cc570-10d9-11ec-818a-5d4c9d0ae440.iso /tmp/union.19/ This is the error I'm getting, and it is happening because of the -add option: + /usr/bin/xorriso -as mkisofs -iso-level 3 -J -joliet-long -append_partition 2 0xef /tmp/union.19/boot-efi.img -partition_cyl_align all -add /tmp/wf_script-eZeXEW/unattended.xml 'C:\System32\Sysprep' -o 3d3839e0-10db-11ec-818a-5d4c9d0ae440.iso /tmp/union.19/ xorriso 1.5.0 : RockRidge filesystem manipulator, libburnia project. Drive current: -outdev 'stdio:3d3839e0-10db-11ec-818a-5d4c9d0ae440.iso' Media current: stdio file, overwriteable Media status : is blank Media summary: 0 sessions, 0 data blocks, 0 data, 42.2g free xorriso : FAILURE : -as mkisofs: Unrecognized option '-add' xorriso : aborting : -abort_on 'FAILURE' encountered 'FAILURE' + ok 'Creating new windows ISO' + EXITCODE=5 + '[' 5 = 0 ']' + echo 'FAILURE: Creating new windows ISO' + exit 5 FAILURE: Creating new windows ISO + cleanup + purge /tmp/etfsimg19 /tmp/etfsmnt.19 /tmp/lower.19 /tmp/prop.19 /tmp/union.19 /tmp/union.19 /tmp/upper.19 /tmp/work.19 + cd /tmp + for X in "$@" + '[' -d /tmp/etfsimg19 ']' + for X in "$@" + '[' -d /tmp/etfsmnt.19 ']' + umount /tmp/etfsmnt.19 + for X in "$@" + '[' -d /tmp/lower.19 ']' + umount /tmp/lower.19 + for X in "$@" + '[' -d /tmp/prop.19 ']' + umount /tmp/prop.19 + for X in "$@" + '[' -d /tmp/union.19 ']' + umount /tmp/union.19 + for X in "$@" + '[' -d /tmp/union.19 ']' + umount /tmp/union.19 + for X in "$@" + '[' -d /tmp/upper.19 ']' + umount /tmp/upper.19 + for X in "$@" + '[' -d /tmp/work.19 ']' + umount /tmp/work.19 + rm -rf /tmp/etfsimg19 /tmp/etfsmnt.19 /tmp/lower.19 /tmp/prop.19 /tmp/union.19 /tmp/union.19 /tmp/upper.19 /tmp/work.19 The reason why i need the -add option is because i need to drop the file unattended.xml into the C:\System32\Sysprep folder in the ISO, so when it will run it will be able to execute the installation by itself. Any help is very much appreciated Regards Danilo