VC++ 6.0 include file

In windows explorer just from the source root directory doing an up arrow to go to the command directory that other include uses, so you count the number of "..\" needed

Ex. your project is at

F:\tfs\aaa\bbb\ccc\ddd

then your include file is at

F:\tsf\eee\fff\ggg\hhh

then you need to open F:\tfs\aaa\bbb\ccc\ddd in windows explorer, count backup 4 times to get to F:\tfs

then your include file is 

#include "..\..\..\..\eee\fff\ggg\hh\filename.h"