The directory for your save files depends on which version of the game you are running: \userdata\ \44350\remote\ Alternative/Old C:\Users\ \Documents\Codemasters\Grid 2\Savegame Hidden/System C:\ProgramData\Steam\RLD!\44350 How to Install a 100% Save Game Backup Your Data
If you use Steam Cloud saves, you may also find a folder with a long string of numbers (your Steam ID). That’s the target. grid 2 pc save game -100 complete-