CNF file icon

CNF File Extension

MySQL Configuration Format

What is CNF file?

CNF is a configuration file associated with MySQL relational database. CNF files store databases startup information in plain text. The main CNF files is my.CNF, saved in /etc folder. CNF files define such database parameters as buffer size, cache settings, or text encoding. One of the most important settings is Timeout parameter, which determines the time window for the database response to be valid. This parameter is mostly is very important for large databases and applications that use complex queries.


MySQL is the most popular relational database management system. MySQL is typically deployed for websites and smaller projects. It is a free and open-source technology used in many projects.

Programs which support CNF file extension

Below you will find an index of software programs that can be used to open CNF files divided into 3 categories according to system platform supported. Files with CNF extension, just like any other file formats, can be found on any operating system. The files in question may be transferred to other devices, be it mobile or stationary, yet not all systems may be capable of properly handling such files.

Programs that support CNF file

Windows Windows
Linux Linux

Updated: 08/29/2023

How to open file with CNF extension?

Problems with accessing CNF may be due to various reasons. Fortunately, most common problems with CNF files can be solved without in-depth IT knowledge, and most importantly, in a matter of minutes. We have prepared a listing of which will help you resolve your problems with CNF files.

Step 1. Get the MySQL

Install software to open CNF file The most common reason for such problems is the lack of proper applications that supports CNF files installed on the system. To address this issue, go to the MySQL developer website, download the tool, and install it. It is that easy The full list of programs grouped by operating systems can be found above. One of the most risk-free method of downloading software is using links provided by official distributors. Visit MySQL website and download the installer.

Step 2. Check the version of MySQL and update if needed

Update software that support file extension CNFYou still cannot access CNF files although MySQL is installed on your system? Make sure that the software is up to date. It may also happen that software creators by updating their applications add compatibility with other, newer file formats. This can be one of the causes why CNF files are not compatible with MySQL. The latest version of MySQL should support all file formats that where compatible with older versions of the software.

Step 3. Associate MySQL Configuration Format files with MySQL

If you have the latest version of MySQL installed and the problem persists, select it as the default program to be used to manage CNF on your device. The next step should pose no problems. The procedure is straightforward and largely system-independent

Associate software with CNF file on Windows

Change the default application in Windows

  • Clicking the CNF with right mouse button will bring a menu from which you should select the Open with option
  • Select Choose another app → More apps
  • Finally select Look for another app on this PC, point to the folder where MySQL is installed, check the Always use this app to open CNF files box and conform your selection by clicking OK button
Associate software with CNF file on Mac

Change the default application in Mac OS

  • Right-click the CNF file and select Information
  • Proceed to the Open with section. If its closed, click the title to access available options
  • Select the appropriate software and save your settings by clicking Change all
  • If you followed the previous steps a message should appear: This change will be applied to all files with CNF extension. Next, click the Continue button to finalize the process.

Step 4. Check the CNF for errors

If you followed the instructions form the previous steps yet the issue is still not solved, you should verify the CNF file in question. It is probable that the file is corrupted and thus cannot be accessed.

Check CNF file for viruses
1. Check the CNF file for viruses or malware

If the CNF is indeed infected, it is possible that the malware is blocking it from opening. Scan the CNF file as well as your computer for malware or viruses. If the scanner detected that the CNF file is unsafe, proceed as instructed by the antivirus program to neutralize the threat.

2. Verify that the CNF file’s structure is intact

If the CNF file was sent to you by someone else, ask this person to resend the file to you. It is possible that the file has not been properly copied to a data storage and is incomplete and therefore cannot be opened. It could happen the the download process of file with CNF extension was interrupted and the file data is defective. Download the file again from the same source.

3. Ensure that you have appropriate access rights

Some files require elevated access rights to open them. Switch to an account that has required privileges and try opening the MySQL Configuration Format file again.

4. Verify that your device fulfills the requirements to be able to open MySQL

The operating systems may note enough free resources to run the application that support CNF files. Close all running programs and try opening the CNF file.

5. Check if you have the latest updates to the operating system and drivers

Regularly updated system, drivers, and programs keep your computer secure. This may also prevent problems with MySQL Configuration Format files. Outdated drivers or software may have caused the inability to use a peripheral device needed to handle CNF files.

Do you want to help?

If you have additional information about the CNF file, we will be grateful if you share it with our users. To do this, use the form here and send us your information on CNF file.

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