First introduced in windows 95, registry is to consolidate ini files in windows 3.1. There are 5 main registry files residing in ststem32\config directory.
SAM security access manager
Security
Software
System
User diff (used for OS upgrade)
Each user has its own registry files as well in the %userprifile% directory. They are
ntuser.dat contain customisation for software and UsrClass.dat contains com related info specific to the user.
Registry is managed by configuration manager in kernel. It has journaling to protect from corruption.
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