Opening FEN Files

The FEN file type is primarily associated with Game engines.

FEN	File extension: FEN
	File type:	data file

What is a FEN file?

FEN files mostly belong to Game engines.

FIFA game data file: Some FEN files are used by the Fenrir Engine to store internal game data, such as settings and match configurations for FIFA games. These files are structured for the game engine and usually need the dedicated software to be read or modified correctly.

Chess board game notation: Other FEN files contain a chess board position using Forsyth–Edwards Notation. They list piece placement, which side is to move, castling availability, and other game state details. Many chess programs—including engines like the Fenix Engine—can interpret these files, and they may also be opened with a simple text editor.

Verify which type your file is before choosing a tool.
For chess positions, a chess analysis tool is ideal.
If it is a game data file, use the associated game engine software.
Always make a backup before editing.

FilExt.com tip: Although they share the same extension, the file structure and required applications differ. Use the proper software to view or modify the file safely.

How can I open a FEN file?

You need a suitable software like Game engines to open a FEN 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 FEN file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a FEN file directly in the browser:. Just drag the file onto this browser window and drop it.

Online FEN Text Viewer

Choose your .fen file to analyze

or drag and drop it here

Online File Viewer

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Programs that open and convert FEN files:

Game engines
See the previous paragraphs to learn more about the main application. FEN files are often referred to as Game engines games because this type of file is primarily created or used by this software.
FileEncryptor (Encrypted File) by ARXsoft Co., Ltd.
The .FEN extension is added to the end of the original file's name. Encrypted file with maximum protected algoritm AES(Rijndael).

Technical Data for FEN File Extension

File classification:

Game

Related files:

pgn, eco, gam, txt, png, exe, cfe, ppenc, axx, dat, cfg, xml, json, bin

The following listing is compiled from the database produced by the 'Associate This!' program, selected data from the main FILExt database and file extension information submitted by users.

ProgramID: WinBoard.FEN
EXEFile: %ProgramFiles%\WinBoard\WinBoard.exe -ini %ProgramFiles%\WinBoard\WinBoard.ini -ncp -lpf

ProgramID: Decode.Document
EXEFile: %ProgramFiles%\DECODE~1.EXE

a fen data file is a special file format and should only be edited and saved with the appropriate software.

How to solve problems with FEN files

Associate the FEN file extension with the correct application.
Update your software that should actually open data files. Because only the current version supports the latest FEN file format. Search, therefore, e.g. on the manufacturer website after an available Game engines update.
To make sure that your FEN file is not corrupted or virus-infected, get the file again and scan it with Google's virustotal.com.
Click here to open your .FEN file online - secure, fast, and no downloads needed.