If you are looking for PS3 exclusives, DLC, or PKG files, the community has moved to more reliable platforms. I strongly recommend avoiding PSNDL mirrors and using these instead:
PS3 HEN/CFW Homebrew Stores:
PSNDLnet: Shadows of the Grid (PS3 Exclusive) psndlnet ps3 exclusive
To play a PS3 exclusive downloaded from PSNDL, you need a license file (.rap). The site became famous for hosting the "PSN Stuff" database, which includes .rap files for nearly every digital PS3 exclusive ever released. If you are looking for PS3 exclusives, DLC,