Since game updates transitioned from Games for Windows Live to Steamworks, managing local files has become necessary to keep your hard-earned progress from corrupting.
: This is used for configuration and sometimes as a fallback for save data: %USERPROFILE%\Documents\NAMCO\ACAH\ Common Save Issues and Fixes ace combat assault horizon save game
The save file uses a simple CRC32 checksum. If you edit a value without recalculating the checksum at the end of the file, the game will declare it corrupted. Use a tool like “ACAH Save Editor” (search GitHub – fan projects exist). Since game updates transitioned from Games for Windows
specifically detailing the fix for graphic settings not saving. Read discussions on the ace combat assault horizon save game