This article explains what a REG file is and how to open one in Windows.
What are those different HKEY registry items in Windows anyway?
A file with the .reg extension is a registration file used by the Windows registry. These files can contain hives, keys, and values. They can be created from scratch in a text editor or can be produced by the Windows registry when backing up parts of it.
There are two main ways to edit the Windows registry:
Think of a REG file as a set of instructions for modifying the Windows registry. Everything in it explains the changes that need to be made to the current state of the registry.
