The save game files are in a proprietary format, but you can find tools online that allow you to edit and manage your save games.
Replace YourUsername with your actual Windows username. gta underground 100 save game
If you're looking for a 100% save game, you can try searching online for a GTA Underground 100 100% save game file. These files usually contain completed missions, 100% collectibles, and other achievements. The save game files are in a proprietary