There is no fixed bin format as it is for example with exe. "bin" just stands for "binary" telling that this file should not be a text file. Anything else is defined in the application which creates / reads this file. In order to know what's inside, how it's encrypted etc, you need to reverse how the game reads and parses the file.
With these information you can build your own bin reader / creator (compiler / decompiler are something else, and therefore should not be used in this context). Maybe someone has done it for this game already but I doubt it if you can't find it.
I know, that this is much harder than just downloading and using a tool. Have fun ;D
I hope I could help you at least a bit
Jeoni
