Use iZip or Unarchiver. Note that iOS handles files differently; you may need to move the ISO into PPSSPP’s internal folder via iTunes File Sharing.
A 7z file is not directly usable by PPSSPP. You must extract it to get the .iso or .cso file. Gta San Andreas Ppsspp Iso File 7z Download
Grand Theft Auto: San Andreas is an action-adventure game developed by Rockstar North and published by Rockstar Games. The game was initially released in 2004 for the PlayStation 2 console. However, with the rise of emulators and portable devices, players can now experience the game on various platforms, including the PlayStation Portable (PSP) using the PPSSPP emulator. Use iZip or Unarchiver
Grand Theft Auto: San Andreas is an open-world game that offers a vast array of gameplay features, including: A 7z file is not directly usable by PPSSPP