The final -A... is likely an of the scene group tag, region code, or CRC32 checksum. In full scene releases, filenames often end with things like -A.pkg , -REPACK , -MRG , or -DUPLEX .
On a standard retail PlayStation 4, PKG files are downloaded automatically in the background via the PlayStation Network (PSN) and installed seamlessly. However, the manual handling of these files is common in specific technical scenarios: 1. Digital Preservation and Backup God of War -A0133-V0100- -CUSA07408- PS4 PKG -A...