HANDLE hDir = CreateFile(lpPath,READ_CONTROL|WRITE_DAC,0,NULL,OPEN_EXISTING,FILE_FLAG_BACKUP_SEMANTICS,NULL);
            if(hDir == INVALID_HANDLE_VALUE)
            return FALSE;

            ACL* pOldDACL;
            SECURITY_DESCRIPTOR* pSD = NULL;
            GetSecurityInfo(hDir, SE_FILE_OBJECT , DACL_SECURITY_INFORMATION,NULL, NULL, &pOldDACL, NULL, (void**)&pSD);

            PSID pSid = NULL;
            SID_IDENTIFIER_AUTHORITY authNt = SECURITY_NT_AUTHORITY;
            AllocateAndInitializeSid(&authNt,2,SECURITY_BUILTIN_DOMAIN_RID,DOMAIN_ALIAS_RID_USERS,0,0,0,0,0,0,&pSid);

            EXPLICIT_ACCESS ea={0};
            ea.grfAccessMode = GRANT_ACCESS;
            ea.grfAccessPermissions = GENERIC_ALL;
            ea.grfInheritance = CONTAINER_INHERIT_ACE|OBJECT_INHERIT_ACE;
            ea.Trustee.TrusteeType = TRUSTEE_IS_GROUP;
            ea.Trustee.TrusteeForm = TRUSTEE_IS_SID;
            ea.Trustee.ptstrName = (LPTSTR)pSid;

            ACL* pNewDACL = 0;
            DWORD err = SetEntriesInAcl(1,&ea,pOldDACL,&pNewDACL);

            if(pNewDACL)
            SetSecurityInfo(hDir,SE_FILE_OBJECT,DACL_SECURITY_INFORMATION,NULL, NULL, pNewDACL, NULL);

            FreeSid(pSid);
            LocalFree(pNewDACL);
            LocalFree(pSD);
            LocalFree(pOldDACL);
            CloseHandle(hDir);