Modding games with bin files

That's not helpful to know - while extensions already are of limited usefulness for identifying a file (ie nothing forbds you to save a text file as Lollards.png, for example), extensions like .bin and .dat are conventionally used for non-standard file types arbitrarily defined by the programmer (as binary application settings or game saves typically are)
 
Try looking up any documentation on the file formats; this will help give you insight into which offsets affect which variables, in addition to giving you a feel for what you can and can't change in-game.

If there's no available documentation, just open the file up in a hex editor and start messing around with different offsets, recording your results. Once you have a better feel for what variables are stored where, see what more you can do with it. If you're running Windows, I recommend HxD as your hex editor of choice.
 

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