All about CNF Files

The CNF file type is primarily associated with MySQL.

CNF	File extension: CNF
	File type:	Configuration file

What is a CNF file?

CNF files mostly belong to MySQL by Oracle. CNF is the file extension for a MySQL configuration file. MySQL is a free, open-source relational database management program. It utilises the Structured Query Language (SQL), which is a programming language used to create, modify and extract data from relational databases, as well as to control user access to the databases. The CNF format is associated with a configuration file used by MySQL that contains settings such as the default character encoding, timeouts, and cache and buffer settings. The file is in plain text format and can be modified according to the requirements of the database. The CNF file in MySQL has the filename my.CNF and is located in the /etc/ directory. The CNF file format is also used by Telnet, a protocol that enables bidirectional text-oriented communication for users on the internet or on a local area network. This is done using a virtual terminal connection. A CNF file is used to store information required for establishing a Telnet connection. This includes the server name, username, and password. The file serves as a shortcut for common Telnet sessions.

How to open a CNF file

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

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Programs that open and convert CNF files:

MySQL by Oracle
See the previous paragraphs to learn more about the main application. CNF files are often referred to as MySQL settings because this type of file is primarily created or used by this software.
ACL2 (formula file) by Robert S. Boyer
ACL2 is a logic and programming language for developing system models and proving the model properties. ACL2 is developed by a team led by an American computer scientist and mathematician Robert S. Boyer. It can be combined with SAT solvers and accepts formulas in CNF file format. This file format is classified as Data. Related links: ACL2 on Wikipedia, ACL2 on swMATH, ACL2 documentation
BASolver (formula file) by St.Petersburg Department of Steklov Institute of Mathematics of Russian Academy of Sciences
BASolver is a mixed boolean-algebraic solver developed by St.Petersburg Department of Steklov Institute of Mathematics of Russian Academy of Sciences. The program's standard format for boolean formulas is the e.CNF file extension. This file format is classified as Data. Related links: BASolver on IEEE, BASolver on researchgate, BASolver on ASE
Cisco Unified CME (Configuration file) by Cisco
CISCO Unified CME is an advanced VoIP software integrated into Cisco Internetwork Operating System. The program's configuration file for phone is in CNF format. This file format is classified as Settings. Related links: Cisco Unified CME on YouTube, Cisco Unified CME on firewall, Cisco Unified CME on researchgate
FreeRADIUS (Configuration file) by FreeRADIUS Development Team
FreeRADIUS is a free and open-source Remote Authentication Dial-in User Service module developed by freeRADIUS Development Team for performing centralized authentication, authorization and accounting. FreeRADIUS certificate configuration files are saved in CNF format. This file format is classified as Settings. Related links: FreeRADIUS repository, FreeRADIUS on Wikipedia, FreeRADIUS on YouTube
FrontPage (Configuration file) by Microsoft
FrontPage is a discontinued Windows-based website administration software and a HTML editor from Microsoft. The program's meta-information is stored CNF file format. This file format is classified as Settings. Related links: FrontPage on WIkipedia, FrontPage on Staffordshire University, FrontPage on YouTube
Hack4Europe 3D (Configuration file) by Richard Cyganiak
Hack4Europe 3D is an exhibition app developed by Richard Cyganiak for creating 3D gallery. CNF file is associated with the program's configuration file. This file format is classified as Settings. Related links: Hack4Europe 3D repository, Hack4Europe 3D
Internet Information Services (Configuration file) by Microsoft
Internet Information Services is a Windows-based server application from Microsoft for hosting web content. It stores several configuration files in CNF file format, such as remote access and services configuration. This file format is classified as Settings. Related links: Internet Information Services on Wikipedia, Internet Information Services on g2, Internet Information Services on YouTube
Java (Page layout) by James Gosling
Java is a general-purpose, high-level, object-oriented programming language developed in the early 1990s by James Gosling at Sun Microsystems. Java can read and write CNF files, which basically contain numbers as Conjunctive Normal Form. This file format is classified as Data. Related links: Java on Wikipedia, Java on YouTube, Java on Twitter
Lotus 1-2-3 (Configuration file) by IBM
Lotus 1-2-3 is a discontinued command line spreadsheet software developed by Lotus Software, which is now part of IBM. Lotus 1-2-3 configuration options are stored in a CNF file extension. This file format is classified as Settings. Related links: Lotus 1-2-3 on Wikipedia, Lotus 1-2-3 on YouTube, Lotus 1-2-3 on Researchgate
MariaDB (Configuration file) by MariaDB Foundation
MariaDB is a fork of the MySQL relational database management system developed by MariaDB Foundation. Option files for configuring the database system are stored in CNF format. This file format is classified as Settings. Related links: MariaDB on Wikipedia, MariaDB on Twitter, MariaDB repository
MathJax (formula file) by American Mathematical Society
MathJax is a JavaScript engine developed by American Mathematical Society for displaying mathematical notations in all web browsers. The program supports mathematical formulas or notations stored in CNF file format. This file format is classified as Data. Related links: MathJax on Wikipedia, MathJax on npm, MathJax repository
MaxHS (formula file) by Jessica Davies
MaxHS is a hybrid MaxSAT solver developed by Jessica Davies for a wide range of optimization problems. The program supports formulas stored in CNF file format. This file format is classified as Data. Related links: MaxHS repository, MaxHS on swmath, MaxHS on MLR
MiniMaxSAT (formula file) by Technical University of Catalonia
MiniMaxSat is a hybrid weighted Max-SAT solver developed by a team from theTechnical University of Catalonia's Computer Science Department. The program supports mathematical formulas or notations stored in CNF file format. This file format is classified as Data. Related links: MiniMaxSAT on Springer, MiniMaxSAT on Journal of Artificial Intelligence Research, MiniMaxSAT on swMath
MinIPAQSoft (Configuration file) by INOR
MinIPAQSoft is a Windows-based configuration software from INOR for connecting and configuring it's programmable 2-wire transmitters: MINIPAQ-H and MINIPAQ-L. MinIPAQSoft configuration file is stored in CNF format. This file format is classified as Settings. Related links: MinIPAQSoft on RFOE, MinIPAQSoft on Manualzz, MinIPAQSoft on Elpro
MiniSat (SNES Station on EmulatorGames.net) by Niklas Eén and Niklas Sörensson
MiniSat is a lightweight and open-source SAT solver developed by Niklas Eén and Niklas Sörensson. MiniSat supports mathematical formulas or notations stored in CNF file format. This file format is classified as Data. Related links: MiniSat repository, MiniSat documentation, MiniSat on Ubuntu
Nextcloud (Configuration file) by Nextcloud
Nextcloud is a free and open-source client-server software developed by Nextcloud for creating and using cloud-storage services. The program's database system configuration file is stored in CNF format. This file format is classified as Settings. Related links: Nextcloud on Wikipedia, Nextcloud repository, Nextcloud on Google Play
Open-WBO (formula file) by Ruben Martins
Open-WBO is an open-source modular and extendable MaxSAT Solver developed by a team led by Ruben Martins. The program supports formulas stored in CNF file format. This file format is classified as Data. Related links: Open-WBO repository, Open-WBO on springer, Open-WBO on researchgate
OpenBSD (Configuration file) by Theo de Raadt
OpenBSD is a BSD-based free and open-source Unix-like operating system developed, with a focus on security, by Theo de Raadt-led team. The operating system uses the CNF file format for storing network security configuration files, which describes the identity of an SSL certificate holder. This file format is classified as Settings. Related links: OpenBSD on Wikipedia, OpenBSD on distrowatch, OpenBSD on Twitter
OpenSSL (Configuration file) by The OpenSSL Project
OpenSSL is a full-featured open-source software library developed by The OpenSSL Project for securing communications over computer networks through the implementation of SSL and TLS protocols. OpenSSL generates a configuration file in CNF format, which contains details of the domain certificate. This file format is classified as Settings. Related links: OpenSSL on Wikipedia, OpenSSL on digicert, OpenSSL on stackoverflow
Optimal Trace (Configuration file) by Micro Focus
Optimal Trace is a software requirements capture and management platform developed by Micro Focus for managing requirements changes throughout a software development cycle and for facilitating collaboration between business and technical teams. Optimal Trace's database system configuration file is stored in CNF format. This file format is classified as Settings. Related links: Optimal Trace on PowerTest, Optimal Trace on Volere, Optimal Trace on ITProtoday
PCSX2 (Configuration file) by PCSX2 Team
PCSX2 is an open-source and a highly compactible PlayStation 2 emulator developed by the PCSX2 Team for Windows, Linux, and MacOS. PCSX2 supports several improvements such as anti-aliasing, texture filtering, and custom resolutions up to 8192x8192 over a wide range of PlayStation 2 video games. The CNF file contains some the programs settings. This file format is classified as Settings. Related links: PCSX2 on Wikipedia, PCSX2 on YouTube, PCSX2 on Twitter
PennMUSH (Configuration file) by PennMUSH
PennMUSH is a MUD-like server developed in C by PennMUSH for creating text-based multiplayer social and roleplaying games. PennMUSH MUSH configuration file, which contains run-time information, such as the MUSH name and listening port, is stored in CNF file format. This file format is classified as Settings. Related links: PennMUSH on repository, PennMUSH on YouTube, PennMUSH on Wikipedia
Percona Monitoring and Management (Configuration file) by Percona
Percona Monitoring and Management is an open-source database tool developed by Percona for managing and monitoring databases. The program stores configuration file for capturing queries and enabling sampling in CNF format. This file format is classified as Settings. Related links: Percona Monitoring and Management on YouTube, Percona Monitoring and Management on repository, Percona Monitoring and Management on g2
PL7 PRO (Configuration file) by Schneider Electric
PL7 PRO is a discontinued IEC programming software developed by Schneider Electric for premium and micro control system applications. The program's gateway configuration file is stored in CNF format. This file format is classified as Settings. Related links: PL7 PRO on YouTube, PL7 PRO on lab4sys, PL7 PRO on euautomation
Python (Page layout) by Python Software Foundation
Python is a high-level programming language developed by Python Software Foundation for general-purpose programming such as machine learning, desktop application, web development, etc. Python can read and edit several configuration file extensions, including those in CNF format. This file format is classified as Data. Related links: Python on Wikipedia, Python on YouTube, Python on Coursera
SNES Station (Configuration file) by Hiryu
SNES Station is a game emulator developed by Hiryu for emulating Super Nintendo on PlayStation 2. SNES Station configuration files are stored in CNF format. This file format is classified as Settings. Related links: Snes Station on Wikipedia, SNES Station on emulatorgames, SNES Station on YouTube
SonarQube (Configuration file) by SonarSource
SonarQube is an open-source code quality management platform developed by SonarSource for analysing codes, detecting bugs, code smells on 17 programming languages. SonarQube's database system configuration file is stored in CNF format. This file format is classified as Settings. Related links: SonarQube repository, SonarQube on Twitter, SonarQube on Wikipedia
Synchronet (Configuration file) by Rob Swindell
Synchronet is a multiplatform Bulletin Board System software developed by Rob Swindell for Windows, Linux, and BSD platforms. It stores various configuration files in CNF such as the files for configuring all nodes for specific instances. This file format is classified as Settings. Related links: Synchronet on Wikipedia, Synchronet on SourceForge, Synchronet on YouTube
Tekken 4 (Configuration file) by Namco
Tekken 4 is the fourth & fifth installment of the Takeen fighting video game series developed by one of the world's largest video games producers Namco. Some of the program's settings such as the default character encoding, and buffer are stored in a CNF file. This file format is classified as Settings. Related links: Tekken 4 on Wikipedia, Tekken 4 on YouTube, Tekken 4 on IMDB
Unity Pro (Configuration file) by Schneider Electric
Unity Pro is a programming environment developed by Schneider Electric for various Modicon and Quantum PLC ranges. Now known as EcoStruxure Control Expert, the program's user configuration file is stored in CNF format. This file format is classified as Settings. Related links: Unity Pro on YouTube, Unity Pro on Allied Electronics, Unity Pro on Researchgate
Varisat (formula file) by Jix
Varisat is a SAT solver developed by Jix using the conflict-driven clause learning algorithm. The program stores formulas in CNF file format. This file format is classified as Data. Related links: Varisat repository, Varisat on Reddit, Varisat on DOCS.RU
Windows (Configuration file) by Microsoft
Windows is a family of GUI-based operating system developed by Microsoft. CNF file is associated with many Windows applications as configuration files and mostly referred to as Speed Dial. This file format is classified as Settings. Related links: Windows on Wikipedia, Windows on britannica, Windows on YouTube
Wireshark (Conformance file) by The Wireshark Team
Wireshark is an open-source network analyzer developed by The Wireshark Team for network troubleshooting analysis at microscopic level. Wireshark's conformance files, which indicates what the compiler should do with certain entries, are stored in CNF format. This file format is classified as Settings. Related links: Wireshark on Wikipedia, Wireshark on YouTube, Wireshark repository
XProtect Corporate (Configuration file) by Milestone Systems
XProtect Corporate is a video management software developed by Milestonesys for large-scale, multi-site, and high-security installations. The program's configuration backup files are saved in CNF format. This file format is classified as Settings. Related links: XProtect Corporate documentation, XProtect Corporate on sourcesecurity, XProtect Corporate on YouTube

CNF file format:

Every file has a defined file format, i.e. how the data is arranged in the file. The first characters in a file identify the file format, for example, HTML files start with the bytes <html>. However, different programs can use the same file extension, and file extensions can be assigned incorrectly. So you need a detailed analysis of a file to find out the format and the associated program. In the following you will find our evaluation of the CNF files:

CNF is a very widely used file extension. The file type does not have a uniform file format. The two most common formats are as follows:

20% of all CNF files belong to PlayStation 2 system configuration. These files are text files and can therefore be read using a text editor. CNF files can be up to 2 KB in size, but are often around 55 bytes - 60 bytes. The file type was primarily used more than 20 years ago. Several words can almost always be found in the files, e.g. BOOT2, cdrom0, SLUS, VMODE = NTSC and VER = 1.00. The file name system.cnf is characteristic of these files.
15% of all CNF files start with the magic bytes 00 04, which are always the first bytes of this file format. They consist of unreadable binary data. A typical file size is 73 KB. The following keywords are characteristic: Associated. These files are often associated with calibration, spectrum and qapd.

The remaining 65% of all CNF files are different files with different signatures, frequently e.g. config, ZIP, CtGfhzwbZ, vti, JWE, CNF, SNES and oldlpkjl. These files sometimes refer to configuration, backup, noavaran, config, ncpphone, plugin or zhls. If you want to find out what your CNF file contains, drag and drop it onto this page.

Technical Data for CNF File Extension

File classification:

Settings

Related files:

jlk, conf, iso, chn, cfn, img, zip, txt, 52, 09, elf, pst, rkv, bin, cfg, xz, snf, 78, exe, irx, sql, tmd, frm

Mime type:

text/x-properties, application/octet-stream

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: ConferenceLink, FileType: SpeedDial, AppName: Conferencing Utility Dll
EXEFile: msconf.dll

ProgramID: ConferenceLink
EXEFile: rundll32.exe msconf.dll,OpenConfLink %l

ProgramID: CNF File
EXEFile: C:\Documents and Settings\Owner\Desktop\Kiss\DirectKiss.exe %1

ProgramID: ConferenceLink
EXEFile: rundll32.exe %SystemRoot%\ServicePackFiles\i386\msconf.dll,OpenConfLink %l

ProgramID: ConferenceLink
EXEFile: rundll32.exe msconf.dll,OpenConfLink

ProgramID: DADiSP.Cnf
EXEFile: %SystemRoot%\notepad.exe

ProgramID: ConferenceLink
EXEFile: rundll32.exe %SystemRoot%\SysWOW64\msconf.dll,OpenConfLink

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a cnf Configuration file is a special file format by Oracle and should only be edited and saved with the appropriate software.

How to solve problems with CNF files

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