Replying to Need help tricking a teacher

Alright so for my english class we get to resubmit homeworks we did over the semester.  The teacher is really busy and just going to glance over everything.  I have done 2 of the 3 assignments.

for the 3rd assignment (which i will not be doing) I want the attachment not to open, like its corrupt or something so she will just say whatever and move on. Either giving me credit or not i dont really care, but she might give up with the file and give me credit so im going to try.

suggestions?
my roommate says just make the whole file 0's and 1's