Answers to these questions could be found here :
What kind of files have been downloaded ?
Does my bandwidth is overloaded due to huge files ?
How often the different filetypes have been seen ?
Does user stop download before completion ?
It could be interesting to know which files use the most your bandwidth.
This section give you this kind of information. For each file type, you
get the number of files downloaded and the number by range of size. Also you can
have the number of download aborted and at what range user stop the download. If too
many download are interrupted, something is wrong with your server.