Damaged shared files don't open anymore

Hi,

A file I share with my colleague via a private network doesn't open anymore after I opened it while my colleague was still working on it. The message error says the file is damaged and can't be retrieved (error code nr 5).

I have installed the BlindOpen script which I found here Re: InDesign 6 is crashing when attempting to open a particular document. All others are opening OK. but I get a javascript error message confirming the file is damaged and can't be retrieved.

Is there anything else I can do to fix the problem ? It's a 23mb file of 200 pages which I use and update on a regurlar basis. Losing it would mean to start everything from scratch...

Best regards,

Dean