The log1 file extension is associated with the Microsoft Windows registry. Default file name is ntuser.dat.LOG1. The file contains a log of changes made to the user's registry over time. The log1 file...
The log1 file extension is associated with the Microsoft Windows registry. Default file name is ntuser.dat.LOG1. The file contains a log of changes made to the user’s registry over time. The log1 file is in binary format with the hidden attribute set. LOG1 files are updated each time a change is applied to the registry.
Possible problems opening and operating LOG1 files include: corruption of the file being opened; incorrect registry links to the file; accidental deletion from the Windows registry; or incomplete installation of a LOG1-compatible program.
The LOG1 extension is one of several comprising the registry “hive.” Microsoft Windows is a common application for handling LOG1 files. These system files fall under the Windows Registry category.
Windows OS
Registry Editor