<CPackWiXPatch>
    <CPackWiXFragment Id="CM_CP_libraries.bin.@WIX_CMP_NAME@.dll">
        <Environment Id="PATH" 
             Name="PATH" 
             Value="[CM_DP_libraries.bin]" 
             Permanent="no" 
             Part="last" 
             Action="set" 
             System="yes"/>
    </CPackWiXFragment>
</CPackWiXPatch>
