How do I open a possibley corrupt file on Open Office?

I have alot of work I’ve done on an Open Office Impress file and now when I try to access it, it says, General Input/Output error. What’s going on? This is duue today and I did my absolute best! I’ve tried emailing it to myself, opening it from a blank presentation file,and I can’t afford to get a zero.How can I open this?Please answer soon.