Hello, im new like new new. And want to learn. Have been reading up the  s4wiki.com exploring nefmoto forums and checking what other people have done. But i still yet to try it on my car.

 Anyways, help me understand the concept of BIN and XDF files. To use TunerPro program I see you need those two files. And what I got from checking other ppl stuff that they are all different. Folder/ tables etc. As I understand this is custom ish. As I see you can get XDF file from your ECU using nefmoto. But what a hell is BIN file and where do I get it. Is it the same thing as in "PC world" usually bin files where "virtual discs" that can be pleased inside a pc. Is it the same? Virtual representation of your ECU? Or is is completely different thing. As I understand BIN and XDF has to match your specific ecu to edit it. 

thank you for your patience answering stupid questions .

So I was wandering can I use any XDF file I find ? Or do I need to make it from scratch(which I still needs to learned, how to) from my exact ecu bin file? Playing around with others XDF I noticed thet values ar out of wak. So I'm guessing I cant?