There is only one file type that uses the .LIVEREG extension:
Symantec Antivirus Session File
File used by Symantec products to register Symantec products online; contains a record of an online registration session; can be found in the "Application Data\Symantec\Shared\Sessions" user directory.
NOTE: LIVEREG files are hidden files, so you must enable hidden file viewing in Windows to see them. They may reside on your computer even after uninstalling Symantec programs.
Updated: October 22, 2009