static extern uint GetEffectiveRightsFromAcl(IntPtr pDacl, ref TRUSTEE pTrustee, ref int pAccessRights);

     Private Declare Auto Function GetEffectiveRightsFromAcl Lib "advapi32.dll" ( _

    'DWORD GetEffectiveRightsFromAcl(

    ret = GetEffectiveRightsFromAcl(pDACL, pTrustee, Mask)