>> CKO file

CKO file format description

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

2 filename extension(s) found in our database.

.cko - ChessBase Key Openings

The CKO game data files are related to ChessBase. The CKO file is a ChessBase Key Openings. ChessBase is a personal, stand-alone chess database.

Game Data files
- / -
ChessBase Key Openings related extensions:
ChessBase Annotations
ChessBase Search Booster
ChessBase Commentators Index
ChessBase Hash File of Doubles Data
ChessBase Team Index
ChessBase Old Game Database

.cko - Kokogut C Output File

The CKO development files are related to Kokogut. The CKO file is a Kokogut C Output File. Kokogut is an implementation of Kogut in Kogut itself. It translates Kogut source into C source, which is then compiled using a C compiler to produce an excecutable. Kogut is an experimental programming language which supports impurely functional programming and a non-traditional flavor of object-oriented programming.

Development files
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Kokogut C Output File related extensions:
Kokogut Module Interface File
Kokogut Compiler Options File

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

Can't open a .cko 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 .cko file extension is often given incorrectly!

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

ck, cki, ckl, ckp, clo, cmo, co, cok, coo, cuo, dko, kco, ko, sko

Is it possible that the filename extension is misspelled?

Similar file extensions in our database:

PSI-BLAST Checkpoint Profile Data
Microsoft SQL Server Checkpoint Data
Off by One Web Browser Cookie Data
Linux 2.6 Kernel Object
Ansys Chemkin Kinetic Data
DISA STIG Checklist

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 .cko file format, then write to us!