For the fsb files, Google "unpack fmod sample bank format" and see what you can get. Bioshock uses the Unreal Engine right? Maybe the Unreal Development Kit has the necessary tools required for packing/unpacking its files. For example, there are been several new maps for Mirror's Edge since it uses Unreal Engine and the UDK can be used to create levels for it (although no Enlighten middleware to spice up lighting sadly).