I'm going to refer you to BlackTyphon's solution.

"I got an solution for me on Final Mix ... If someone can'T play the final mix version ... Here is an Solution ...
Go to gamejolt and search for FNAFB 2 Edited ... Download it and download Final mix ... On Fnafb 2 folder delete - "Audio , Data and Graphics" go to Final mix and copy the folders Audio, Data and Graphics and put on fnafb 2 edited folder and Try to open ... For me it works."

Hopefully this should help. good luck!