.EFI File

.efi is Extensible Firmware Interface File

Key Features: .EFI File Extension

Features	Description
File Extension	.efi
Format	Binary
Created by	UEFI Forum
Category	System

What's on this Page

How to open:
How to convert:

What is an .EFI file?

File extension efi is used for Extensible Firmware Interface files nowadays used and supported in most operating systems, including Windows, Linux, OS X (macOS) and other. The latest specification, UEFI, was released in 2007.

The Unified EFI (UEFI) specification (previously known as the EFI specification) defines an interface between an operating system and platform firmware. The interface consists of data tables that contain platform-related information, boot service calls, and runtime service calls that are available to the operating system and its loader. These provide a standard environment for booting an operating system and running pre-boot applications.

The UEFI specification was primarily intended for the next generation of IA architecture-based computers, and is an outgrowth of the "Intel Boot Initiative" (IBI) program that began in 1998. Intel's original version of this specification was publicly named EFI ending with the EFI 1.10 version. In 2005 The Unified EFI Forum was formed as an industry-wide organization to promote adoption and continue the development of the EFI specification. Using the EFI 1.10 specification as the starting point, this industry group released the follow on specifications renamed Unified EFI.

Files with efi extension can be typically encountered in installation disk for various operating systems, including Windows, OS X (macOS) or Linux.

How to open:

EFI/UEFI files are accessed by the system during the installation process.

How to convert:

Generally speaking, firmware files cannot be converted to anything else.

Extensible Firmware Interface File - File openers

Windows

EFI Developer Kit

Mac

EFI Developer Kit

Linux

EFI Developer Kit

UEFI Forum

.efi - File Extension

System

Binary

How to solve problems with EFI files

Associate the EFI file extension with the correct application. On :
Windows: Right click on any EFI file and then click "Open with" > "Choose another app". Now select another program and check the box "Always use this app to open *.EFI files". Mac: Right click (or Ctrl-click) the EFI file, then click "Open with" > "Other...". Then choose another program and check the "Always Open With" box. Linux: Right click on the file, and select "Open with" and choose another program. iPhone: Tap the file. If you do not see an app to open the file, then tap Share "Share" and choose an app. Alternatively, save the file. Then open the Files app Files app. There long-press on the file, then release your finger. You will see a black menu bar. Then tap "Share" and select an app. Android: Tap the Settings icon on your smartphone, then tap on the Apps section. There tap the Options icon in the top right-hand corner of the screen to change the default apps.
Update your software that should actually open .EFI is Extensible Firmware Interface File. Because only the current version supports the latest EFI file format. Search, therefore, e.g. on the UEFI Forum manufacturer website after an available .EFI is Extensible Firmware Interface File update.
To make sure that your EFI file is not corrupted or virus-infected, get the file again and scan it with antivirus software.