A file with the extension .list is often a PeerGuardian 2 blocklist. It should be placed inside the lists folder in the PeerGuardian 2 installed directory. PG2 blocklists include everything from Educational facilities to the Recording Industry Association of America (RIAA). Obtaining a blocklist .list file is easy using the PG2 built-in update service. Never accept .list files for PG2 from any site other than the PG2 main site.