How do I recover a corrupt PowerPoint 2013 presentation?

Basically, I have three separate presentations with the same problem and I have read the other thread regarding this and have tried to load the presentation up through Open Office and this has failed. Does anyone else have any ideas as these are extremely important to me!!! F.Y.I - When I open the file within Open... show more Basically, I have three separate presentations with the same problem and I have read the other thread regarding this and have tried to load the presentation up through Open Office and this has failed. Does anyone else have any ideas as these are extremely important to me!!!

F.Y.I - When I open the file within Open Office, it loads up a load of hashes in the writer function of the program.
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