>> FEN file

FEN file format description

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

1 filename extension(s) found in our database.

.fen - Forsyth–Edwards Notation Data

The FEN data files are related to ChessBase. The FEN file is a Forsyth–Edwards Notation Data. Forsyth–Edwards Notation (FEN) is a standard notation for describing a particular board position of a chess game.

Data files
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Forsyth–Edwards Notation Data related extensions:
ChessBase Annotations
ChessBase Search Booster
ChessBase Commentators Index
ChessBase Hash File of Doubles Data
ChessBase Team Index
ChessBase Old Game Database

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

Can't open a .fen 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:


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.

The .fen file extension is often given incorrectly!

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

ben, cen, den, en, fdn, fe, feb, fem, ffn, fn, fne, frn, fsn, fwn, gen

Is it possible that the filename extension is misspelled?

Similar file extensions in our database:

English Language Info File
Surface Evolver Data File
CEN EN 13032 Photometric Data
Unknown FRN File
XMVB Density Data
Greeting Card Factory Document

Operating systems currently supports the following operating systems:

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

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