This is so off topic, but:
Have your friend use Linux!!!  (it's only free if your time is worth 
nothing)


wipe () 
{ 
    for i in "$@";
    do
        dd if=/dev/urandom of="$i" bs=4096 count=$((`wc -c 
<"$i"`/4096+1)) conv=notrunc;
    done;
    sync;
    sync;
    chattr +s "$@";
    rm "$@";
    sync
} 

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