Files
represent the total number of hits (requests) that actually resulted
in something being sent back to the user. Not all hits will send data,
such as 404-Not Found requests and requests for pages that are already
in the browsers cache.
Tip: By looking at the
difference between hits and files, you can get a rough indication of
repeat visitors, as the greater the difference between the two, the
more people are requesting pages they already have cached (have viewed
already).