Function PowerWriteACDefaultIndex 

pub unsafe fn PowerWriteACDefaultIndex(
    rootsystempowerkey: Option<HKEY>,
    schemepersonalityguid: *const GUID,
    subgroupofpowersettingsguid: Option<*const GUID>,
    powersettingguid: *const GUID,
    defaultacindex: u32,
) -> u32