Corrupt PST files

One of my PST files have corrupted and I think itis because the size was too large, in excess of the 1.82GB limit as indicated in the MS knowledge base

There is one particular folder which I cannot access and tht is the one with all my project data. I have tried all the suggestions from Microsoft, Scanpst, Inbox Repair, compact etc but none of them work.

Does anyone know of a reliable was of accessing the file to retrieve messages?

Any ideas will be appreciated.