Adobe Captivate could not open.......Ensure that the file isn't open, the file isn't damaged....etc.

Captivate 5

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I have been working on this project (@175 slides).  Suddenly, as I'm saving my changes, the program freezes & has to shut down & now it appears the file is corrupt.  Am I basically screwed here?  Is there any hope for this file?  I read that Captivate 5 supposedly handles projects with 400+ slides, so mine shouldn't be an issue.

There are no other programs open, the file isn't already open.  I'm guessing I'm screwed & get to spend 2 days redoing the work I just did.  Thankfully I have a backup, but a backup that doesn't include about 16 hours worth of changes.  This has always been a shaky product & I'd hoped that Captivate 5 had improved upon that, but I guess not.

Any help is appreciated