This could be done well in case you're using a PDM system (which I'm not sure if you're using or not).
Right click on a file and select properties. Now check if you can see the previous versions tab. In case you're lucky you might get something from there.
As Deepak stated it would be much easier with a pdm system. If you have SWorks Pro or Premium, WPDM is already included - just needs to be setup and activated.