Opening an EFI File

The EFI file type is primarily associated with UEFI Development Kit.

EFI	File extension: EFI
	File type:	OS-firmware interface

What is an EFI file?

EFI files mostly belong to UEFI Development Kit by Intel. An EFI file contains system-level data saved by Extensible Firmware Interface and used to interface between an operating system and platform firmware. Such information is usually saved as a self-contained filesystem using the Unified Extensible Firmware Interface (UEFI) specification. Various boot managers use information saved in an EFI file to boot an operating system from a sector on a dual-/multi-boot system. EFI was originally developed to replace BIOS on Intel-based systems. Today, however, UEFI which is based on EFI is processor and operating system independent. EFI files on a system are found in the \EFI\BOOT\ folder in a boot sector.

How to open EFI files

You need a suitable software like UEFI Development Kit from Intel to open an EFI file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your EFI file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a EFI file directly in the browser:. Just drag the file onto this browser window and drop it.

Online EFI Text Viewer

Choose your .efi file to analyze

or drag and drop it here

Online File Viewer

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EFI format details:

The file format determines how the data is stored in the file. Often, the file format can be deduced from the file extension or the initial bytes (called the signature). Frequently, however, one file extension is used by different programs for different file formats, and one file format for different file extensions. Knowledge is power - this also applies when dealing with unknown or faulty files. Below is our analysis of the EFI files:

The EFI extension is very commonly used. This EFI file itself is among the most popular common file types and is mainly used by one program with a specific format. The two most popular formats are as follows:

• 95% of all EFI files are Extensible Firmware Interface x86-64 application files, which are based on the EXE file format. EXE is the abbreviation for executable and is the standard executable file format on Windows. The format can be identified by the letters "MZ" at the beginning. Executable files can also be used to distribute viruses and other types of malicious software (malware). They consist of unreadable binary data. The file size is in the range of 33 KB to 1 MB. The file type is relatively new. The following keywords are characteristic: !This program cannot be run in DOS mode. The following filename is common: BOOTX64.efi or Bootmgr.efi. Files like these have the following tags: grubx, open, bootia, winload, bootmgfw, core, boot and bootaa.

All the rest of the EFI files (5%) have different formats. Sometimes used for memory, memtest, shell, ipxe, image, cloverx, section, refind or bios. If you want to find out which format your EFI file belongs to, just click on the button "Choose your .efi file to analyze".