HANDLE hFile = CreateFileW(m_achTempFilePath, GENERIC_READ|GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL) ;

CDacl dacl;
dacl.AddAllowedAce(Sids::World(), SPECIFIC_RIGHTS_ALL | STANDARD_RIGHTS_ALL) ;
CSecurityDesc sd;
sd.SetDacl(dacl);
CSecurityAttributes sa;
sa.Set(sd, true);