I strongly advise you not to mess with it. It's illegal to mess with it but right now that's beside the point. Without a doubt there is a byte or word somewhere in the file that states exactly how long the file is, and there is also probably an array of indexes that refer to other areas inside the file. If you add any text or remove it, you will most likely break all of those references, thereby corrupting the file and making it useless. Try to achieve this in some other way, because this isn't going to work.
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