Halo: Spartan Assault Checksum Fixer Screenshots: How to use: 1) Use Horizon to extract the savedata from the savedata.bin STFS container. 2) Mod your savedata manually, then open it in the checksum fixer. 3) Use Horizon to replace the savedata with the modded one in the savedata.bin STFS container. Download: Hidden Content: You must reply before you can see the hidden data contained here. Have fun!