sfall-readme.txt said:IMPORTANT NOTE:
If you are using a mod that included sfall already (e.g. killap's unofficial patch or RP, etc.) then that mod has probably included a custom modified ddraw.ini. In that case, overwriting it with sfall's vanilla ddraw.ini will be likely break your game. Instead, only overwrite ddraw.dll, and keep the mod's existing copy of ddraw.ini. (Or, if you know what you're doing, you can merge them together by hand.)