The FAT32 file system not supporting files larger than 4GB, PSARC handles decompressing the content of archives using this format.
Note: this is a possibility for certain games containing this type of archive. It is not a global solution for all games containing files larger than 4GB.
Usage:
Spoiler
1) Get the archive by downloading it
2) Extract zlib.net.dll and PSARC.exe into any folder.
3) Find the files larger than 4Gb, for example PS3_GAME/USRDIR/buildmainpak22.psarc (5,596,444,529 bytes)
4) Copy the pak22.psarc file(s) into the folder containing zlib.net.dll and PSARC.exe.
5) To extract pak22.psarc, simply drag the file onto the PSARC.exe file
6) Then copy the pak22 folder containing the extracted files into the same folder where the original file was located.
7) You can then delete pak22.psarc.
8) Use the backup manager to load your game.
2) Extract zlib.net.dll and PSARC.exe into any folder.
3) Find the files larger than 4Gb, for example PS3_GAME/USRDIR/buildmainpak22.psarc (5,596,444,529 bytes)
4) Copy the pak22.psarc file(s) into the folder containing zlib.net.dll and PSARC.exe.
5) To extract pak22.psarc, simply drag the file onto the PSARC.exe file
6) Then copy the pak22 folder containing the extracted files into the same folder where the original file was located.
7) You can then delete pak22.psarc.
8) Use the backup manager to load your game.
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Source
Everything for PS5 · PS4 · PS3