RegdatXP reads non active WinNT4/2Kx/XP/Vista registry files like ntuser.dat and Software and compares them to the current Registry. It has binary Search and Replace functions for the Registry. The full version can export data from corrupt registry files, repair a corrupt file directly in many cases, and remove user passwords from offline Sam files.
Could actually repair corrupt registry files that would prevent a system from booting, not just clean out invalid entries like most registry tools.
Cons
Can no longer find a valid link to register this version.
Summary
I am a registered user of version 3.2b and have been searching for a while to find a valid registration link for version 4.3. RegDatXP has been one of my most important tools as a computer tech.