EFI file format description

Many people share .efi files without attaching instructions on how to use it. Yet it isn’t evident for everyone which program a .efi file can be edited, converted or printed with. On this page, we try to provide assistance for handling .efi files.

1 filename extension(s) found in our database.

.efi - Extensible Firmware Interface

The EFI file is an Extensible Firmware Interface. The Unified Extensible Firmware Interface (UEFI) is a specification that defines a software interface between an operating system and platform firmware. UEFI is meant to replace the Basic Input/Output System (BIOS) firmware interface.

Application:

Category:

Application files

Mime-type:

application/octet-stream

Magic:

- / -

Aliases:

Extensible Firmware Interface related extensions:

.m3g: Mobile 3D Graphic
.x16: Macromedia Extension Plugin 16
.pmp: Adobe Premiere Meta-Plugin
.qpx: QuickTime Player Extension
.8xk: MirageOS Flash Application
.x86: Linux X86 Executable File

Naturally, other applications may also use the .efi file extension. Even harmful programs can create .efi files. Be especially cautious with .efi files coming from an unknown source!

Can't open a .efi file?

When you double-click a file to open it, Windows examines the filename extension. If Windows recognizes the filename extension, it opens the file in the program that is associated with that filename extension. When Windows does not recognize a filename extension, you receive the following message:

Windows can't open this file:

example.efi

To open this file, Windows needs to know what program you want to use to open it. Windows can go online to look it up automatically, or you can manually select one from a list of programs that are installed on your computer.

To avoid this error, you need to set the file association correctly.

Open Control Panel > Control Panel Home > Default Programs > Set Associations.
Select a file type in the list and click Change Program.

The .efi file extension is often given incorrectly!

According to the searches on our site, these misspellings were the most common in the past year:

dfi, ebi, eci, edi, ef, efk, efl, efo, efu, egi, ei, eif, eri, eti, evi

Is it possible that the filename extension is misspelled?

Similar file extensions in our database:

.eif: Envex Import Format File
.efo: EASE Focus Data File
.dfi: TI bqEASY Data Flash Image
.ffi: Atech FastFont Data
.ef: Diploma Exam File
.ebi: The Bat! Encrypted Message Index

Operating systems

DataTypes.net currently supports the following operating systems:

Windows XP/Vista, Windows 7/8/10, Windows 11, CentOS, Debian GNU/Linux, Ubuntu Linux, FreeBSD, macOS, Mac OS X, iOS, Android

If you find the information on this page useful, please feel free to link to this page.

https://datatypes.net/open-efi-files

If you have useful information about the .efi file format, then write to us!