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My name is David.
Try opening the file again and this time when the error appears, after acknowledging the error click the File menu then Save As then in the window that appears click the Save As Type drop down box and select Word Document and then save the file. Since the file is very large make sure the hard drive has enough space to save the file. Once the file is saved attempt to open the file in Word and it should open.
Please let me know the result.