The Steam Deck is not a “port” but a full Linux PC. It plays the (or the Definitive Edition) perfectly.
This title appears to be a common filename for a of Grand Theft Auto: San Andreas often found on file-sharing sites. In the context of the game's 2004 release:
The adaptation of Grand Theft Auto: San Andreas for the PSP involved significant modifications to gameplay mechanics to accommodate the limitations and features of the portable console. Key adaptations included: