Was the Windows Registry a Good Idea? (2007)
blog.codinghorror.com
blog.codinghorror.com
The Registry could have been designed to be a standard settings store but without the drawbacks of being monolithic, not human-readable, and being one giant point of failure.
There is also C:\Users\%username%\AppData\Local\Packages\APPNAME\Settings
Each app can use registry, and the registry will be isolated to settings.dat. (You can mount that on regedit and see that is just a usual registry hive)