RegistryChangesView is a freeware app to take a snapshot of the Windows Registry and compare it with another Registry snapshot.

You can compare it with the current Registry or with Registry files stored in a shadow copy created by Windows.

When comparing two Registry snapshots, you can see the exact changes made in the Registry between the two snapshots, and optionally export the Registry changes into a standard .reg file of RegEdit.

Similar:

How to Automatically Back up the Registry on Windows 10
5 Ways to Open Registry Editor in Windows

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