It looks like you learned an important lesson a bit painfully: always back up! I don't know what happened to them, but if the only copy you had of them was supposedly in the zip file you sent your teacher, I'd say it's your own fault you lost all your work. Better luck next time.
John A
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I may be thinking to simple, but do you by any change have a new version of Winzip and your teacher doesn't? Or different Operating Systems?
Nick Evan
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