The pattern files about the L7 filters are located in the directory /etc/l7-protocols.
For more details you should read the how-to http://l7-filter.sf.net/Pattern-HOWTO
I am stuck in updating L7 filter Patterns.
I downloaded the actual l7-protocols-2008-03-24 from l7-filters.sourceforge.net and untarred/unzipped to:
/etc/l7-protocols AND /var/register/system/net/L7/..
but even after a reboot I cannot see the updated patterns in web interface.
Any help appreciated