What is REG? What Opens a REG? File Format List from WhatIs.com

File Extension

REG File Format

Registry data file for Windows

REG file format icon

REG is a file extension for a registry data file format used in Microsoft Windows.

The registry is a single store of information as to what hardware is attached, what system options have been selected, how computer memory is set up, and what application programs are installed.

REG files are created when branches or the entire registry is saved. REG files can be double clicked to add their contained settings to Windows.


Learn more about REG files:

See the Microsoft page for windows registry information for advanced users.

Ed Skoudis talks about  Windows registry forensics: Investigating system-wide settings at Search Security.

Get help with REG files and the registry at IT Knowledge Exchange.

This was last updated in July 2010
Editorial Director Margaret Rouse

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