A .pkg (package) file is the standard file format used by Sony to install software, updates, and downloadable content (DLC) on the PlayStation 3 system.
If you’re looking for the or usage of such a string: 1fc 25 ps3pkg
This is the most critical warning. Because official FC 25 does not exist for PS3, any file claiming to be it is created by an unknown third-party developer. Hackers often use the lure of new games to distribute malware, RATs (Remote Access Trojans), or corrupt files that can brick your console. Always scan these files with an antivirus before transferring them to your PS3. RATs (Remote Access Trojans)