include file in include library ?

[faustf]

Hi i try to include this library

#include <Trade\PositionInfo.mqh>
#include <Trade\Trade.mqh>

in my  common.mqh library

i try with <>  and not  work , but  i try also in this mode

#include "Trade\PositionInfo.mqh"
#include "Trade\Trade.mqh"

and  not  work but  if  i remove folder and move  file  in main folder include  work 

anyone  can explain me  why this ??  thanks