.LOG1 File Extension
Windows Registry Hive Log File
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What is a LOG1 file?
Log file used by the Windows registry; contains a trace of changes that have been made to the user's registry over time; typically found in the user's directory or under the %SystemRoot%\System32\config directory in Windows; saved in a binary format and as a hidden file in Windows.
LOG1 files are a part of the overall group of files that comprise the registry "hive." Other files include .LOG and .LOG2. A common LOG1 file is ntuser.dat.LOG1.