As far as I read, files are introduced in OS books. Before an OS is installed on a bare computer system, does the computer use files?In particular, executable files have formats in OSes, e.g. executable files have ELF format in Linux, which can guide the loader in the OS to load them into memory when running them. Before installation of an OS, does the computer system have the concept of executable files or something similar for storing programs?  If so, what is their format, for example, on a X86 or X86-64 bit bare computer machine?Thanks.I am not asking about booting but I am curious how a program is stored on a bare computer. A program may be for booting or not for booting. In particular, I am interested in how a user program is stored on a bare computer.
Do bare computer systems (without OS installed) use (executable) files?
architecture;operating systems;files