wimlib

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# mount --mkdir ~/Downloads/win-installer.iso /mnt/iso/win-installer # I use windows server 2025.
# mount --mkdir ~/Downloads/winvos.iso /mnt/iso/winvos # Windows ValidationOS.
# mkwinpeimg --windows-dir=/mnt/iso/win-installer --arch=amd64 --overlay=/mnt/iso/winvos --wim=/mnt/iso/winvos/ValidationOS.wim ./winvos.img
:: Copying primary boot files from mounted Windows ISO (/mnt/iso/win-installer)                              [DONE] 
:: Copying /mnt/iso/winvos/ValidationOS.wim to temporary directory                                           [DONE] 
:: Overlaying "/mnt/iso/winvos" on the Windows PE filesystem                                                 [DONE] 
:: Rebuilding WIM with changes made                                                                          [BUSY]
ERROR: "/tmp/tmp.U67iRIGE3g/sources/boot.wim" contains 2 images; Please select one.
Usage:
    wimlib-imagex update WIMFILE [IMAGE]
                    [--check] [--rebuild] [--threads=NUM_THREADS]
                    [DEFAULT_ADD_OPTIONS] [DEFAULT_DELETE_OPTIONS]
                    [--command=STRING] [--wimboot-config=FILE]
                    [< CMDFILE]

Some uncommon options are not listed; see `man wimupdate' for more details.