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# wget --header='Accept-Encoding: gzip' -O root.bin.gz http://bellard.org/jslinux/root.bin
# gunzip root.bin.gz
# mkdir mnt
# mkdir files
# sudo mount -t ext2 -o loop root.bin mnt
# dd if=/dev/zero of=files/root.bin bs=1k count=4096
# sudo mke2fs -m 0 -i 2000 files/root.bin
# mkdir mnt2
# sudo mount -t ext2 -o loop files/root.bin mnt2
# sudo cp -dpR mnt/* mnt2/
# sudo umount mnt2/

and use CocProxy or Fiddler's AutoResponder for http://bellard.org/jslinux/root.bin