PROBLEM: Fidbox.dat is a large (>1.2 GB) and growing (approaching 8K fragments) problem on my system.
STATUS: I contacted Check Point Technical Support and received an acknowledgement that the problem exists and is recognized. It will be fixed in Zone Alarm Version 9.0. ("Our version 9.0 doesn't use fidbox and will be released in the near future, don't have an exact date at this time.")
The reply also mentioned that 9.0 is currently in beta test. However, a cautionary statement was included about using the beta version, as there is no technical support and the user should have system programmer level skills (registry edit, etc .... ).
Windows XP Pro SP3