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UEFI bootloader files typically use the .efi file extension. This extension is specifically designed for files that the UEFI firmware can execute during the boot process. The UEFI (Unified Extensible Firmware Interface) standard replaces the traditional BIOS firmware interface with a more efficient and flexible method for booting operating systems.
The .efi files contain the necessary code that allows the firmware to load and execute an operating system or bootloader, serving as an intermediary between the hardware and software. These files are stored in a designated partition on the hard drive, typically formatted with FAT32, which is supported by UEFI firmware.
The other file extensions listed do not serve this purpose. For instance, .img refers to disk image files, .exe is used for executable files primarily in Windows, and .iso denotes an image of an optical disc. Each of these serves different functions and is not directly related to the UEFI boot process. Thus, .efi is the correct and relevant choice for UEFI bootloader files.