What is the File Extension .Config?


CONFIG is the extension for a configuration file. Configuration files are the initial settings for computer programs. They are used in the operating system, servers and some application programs.

Microsoft .NET

  • The CONFIG file type is primarily associated with the Microsoft ".NET" application suite, but it can also be associated with several others.

Microsoft DOS and Windows

  • In Microsoft files, DOS (disk operating system) primarily relies on config.sys for its initial settings. The Microsoft Windows family of operating systems and their attendant applications utilize a similar system of configuration files.


  • IBM’s OS2 uses a binary format for its configuration file and also has an .INI suffix.


  • Within CRISP (Computer Retrieval of Information on Scientific Projects), the CONFIG file is used to configure output from "Monte Carlo" computer trials and studies. CRISP is a searchable database of federally funded biomedical research projects.

Apple II

  • In Apple II, CONFIG files are used for initial settings for Mac computer programs.

RockBox MP3

  • Configuration files are also used in RockBox, an open source firmware for MP3 players.

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