Save games are mostly in one of these three directories (for Windows):
1. In the game folder is a sub folder called "Save" (or something like that).
2. In C:\Users\*Your User*\Documents ... there could also be a folder called after the developer or the game, in which the save files are stored.
3. In C:\Users\*Your User*\AppData ... this folder is a hidden folder. First you need to unhide it. In this folder are three sub folders (LocalLow, Local, Roaming). Look in "LocalLow" and "Roaming" for a folder called after the developer or after the game.