Steam Cloud may sometimes sync a corrupted file, making it impossible to recover without a local backup.
GFWL remnants or an incomplete write. Fix: ace combat assault horizon save game
The game typically stores its data in two primary locations depending on whether you are using Steam Cloud or local storage: Steam Cloud may sometimes sync a corrupted file,
C:\Program Files (x86)\Steam\userdata\[Your Steam ID]\228400\remote ace combat assault horizon save game