Notes about the AUTOREG file extension:
Incorrect file associations could be the result of underlying issues within your PC system. As such it is highly recommended to scan your PC for invalid registry entries, unused processes and other unfavourable system settings to identify slowdown issues.
The AUTOREG file type is primarily associated with 'Mozilla (Netscape)' by Mozilla.org. XPCOM Auto Registration clue. Tells Mozilla to check for newly installed components the next time it launches.