Notes about the UNKNOWN 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 UNKNOWN file type is primarily associated with '[None]'. This entry is here as a pointer only since the logs show many search on UNKNOWN. Take the link in the Associated Links to a FAQ that will give you some tips on how to research a file type.