Error Opening File

I am having issues with Microstation failing to open a DGN file. It comes up with the 'Error opening file [FILEPATH.dgn] = (0x13013)'. It crashed when I was trying to open one of sheets that I have created. The following log is taken from the Event Viewer when Microstation crashed. Please advise on how to recover these files. I have attempted to open previous versions of this file through Windows explorer but the same error came up. So now it seems like I have to start my work all over again. Urgently needs advise. Thanks.

Faulting application name: ustation.exe, version: 8.11.7.443, time stamp: 0x4c3f498c
Faulting module name: ustation.dll, version: 8.11.7.443, time stamp: 0x4c3f31e5
Exception code: 0xc0000005
Fault offset: 0x003a8098
Faulting process id: 0x1dd8
Faulting application start time: 0x01d1517aed2e491f
Faulting application path: C:\Program Files (x86)\Bentley\MicroStation V8i (SELECTseries)\MicroStation\ustation.exe
Faulting module path: C:\Program Files (x86)\Bentley\MicroStation V8i (SELECTseries)\MicroStation\ustation.dll
Report Id: 91e0ee42-c2ec-11e5-9e6c-3417eb9697fd

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