Creating, downloading, or distributing copyrighted game ISO files from the internet is a form of piracy and is illegal. Always extract files directly from your own legally purchased game discs. Furthermore, for emulators like Xanite or aX360e to function, you are required to extract the BIOS files from your own personal Xbox 360 console. Downloading a BIOS from the internet is also illegal. The console-modding community is passionate about legal homebrew and game preservation, and all official guides stress this point strongly.