doc iconReg is extension of Windows registry backup file. It can be opened by Windows operating system.

Windows registry: It is one of the most commonly used part of Windows. It includes detailed information about windows settings and convenient softwares for running files.

When you make double click on REG file the information is applied directly on Windows. In this case, you should be careful. If registry crashes windows cant work conveniently. Even in some intances, it is impossible to open those files. 

For opening registry you should click start up-run part and write \"regedit\" in the box.  

What to use reg

windows pctools

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