Hello everyone. I need some help related to Fallout and mods.

Here's the deal.

I have a serious problem here. Have a self-made mod which I edited in the G.E.C.K. for Fallout New Vegas. When I played the game, the stuff which I put previously in the containers.. was all gone. But I DO have a backup file. That file is a BAK file. How do I restore the old file so I might get back all my lost equipment!? It were all my caps, pre-war money ammo, ETC.

I hope someone can help me. Spend a lot of hours into getting all that stuff.