A sniffer file extension is related to the Sniffer from McAfee. A sniffer file contains data.
SNIFFER file extension - Sniffer trace data
What is sniffer file? How to open sniffer files?
File type specification:
The sniffer file extension was used by an old program called Sniffer, discontinued in 2004 and formerly developed and sold by the Network Associates (now known as McAfee). Sniffer was probably some sort of computer security software.
This sniffer file type entry was marked as obsolete and no longer supported file format.
This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.