That is indeed the save file and indeed if it's a fresh install with no save data in either 287700 or 311340, the save file copied to the 287700 location will indeed use the save file and start you from where you last left off. Most all information I've ran across states 287700 as the save file. I find this interesting considering that I've been working with save file backup data the last few weeks and was just getting ready to post my scripts (as a guide) for automatic backup & game launch with a 2nd script to restore backed up game files. To back it up: This old guide also lists 311340 as the valid folder. I've been around since the game released, trust me. The single player side of the game is 287700. Looking at it, it appears to me the one in 311340 is MGO data.