It looks like you’re referencing a file/ROM naming convention from a site like for Far Cry Classic on PS3 (PSN release, EU version, NPEB00989).
Since you asked for a “good guide” — I assume you want to know how to this specific .pkg (and possibly .rap file) on a jailbroken PS3 or RPCS3 emulator . -SuperPSX.com--Far Cry Classic PSN-NPEB00989-EU...