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.CONFIG File Extension

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File TypeConfiguration File

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CategoryDeveloper Files


This file is saved in a plain text format. You can open and view the contents of this file using a text editor.


Configuration information file used by various applications; contains plain text parameters that define settings or preferences for building or running a program; often referenced by software development programs for configuring applications.

More Information

An example CONFIG file is Microsoft's Web.config file, which can be edited with Visual Web Developer, a program included with Microsoft Visual Studio. This file contains XML configuration information that controls how a website works, from individual pages to an entire ASP.NET application.

NOTE: Since CONFIG files are stored in plain text, you can view and edit them with a text editor such as Microsoft Notepad. However, you should not edit a CONFIG file without first knowing its contents, since it may corrupt the file and cause its associated application to malfunction.

Programs that open CONFIG files
File Viewer Plus
Microsoft Visual Studio 2015
Adobe Dreamweaver CC 2015
Microsoft Notepad
Microsoft WordPad
Adobe Dreamweaver CC 2015
Apple TextEdit
MacroMates TextMate
Updated 9/14/2010