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Are you playing on a or the RPCS3 PC emulator ? Do you already have CFW/PS3HEN installed on your console?
Pkg Ps3 Roms: The Ultimate Guide to Installing PS3 Digital Games
ROMs, or Read-Only Memory, refer to digital copies of data from read-only memory chips, often used in video game consoles and arcade machines. When we talk about PS3 ROMs, we're referring to digital backups or rips of PS3 games. These are essentially copies of the game data extracted from the original game discs. The creation and distribution of ROMs for games still under copyright are controversial, often walking a fine line between preservation and piracy.
Digital formats natively meant for hard drive installation. They require an accompanying activation file (RAP file) to unlock the full game.