Question: PLEASE help with Corrupted Maple File

After saving and closing my maple file, it was corrupted when I tried to open it again later. 

I tried searching for a solution without any luck...can someone help me repair it?

Regnede_Eksamenssæt.mw

(When it asks to save it as Regnede_Eksamenssæt_1 only a small part of the document is included)

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