Regarding the how to set the relative path:

Regarding the how to set the relative path:
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D:\tech\code\fileformats\3gpp\reader

..\..\..\..\inc

it refers the path as follows:
excape from the four directories:

D:\tech\inc

My Current directory is as follows:
D:\tech\code\Apps\Mp4Propertybag_Source\Mp4PropertyPag

common.h file's Current Directory D:\NokiaPCFilters\tech\inc

Relative path: ..\..\..\..\inc

Target directory:

D:\tech\code\fileformats\3gpp\reader\inc

Relative path:
..\..\..\fileformats\3gpp\reader\inc

Target Dir:
-------------
D:\tech\code\fileformats\3gpp\inc

Relative path:
--------------
..\..\..\fileformats\3gpp\inc

Target dir:
--------------
D:\tech\code\filters\inc

Relative path:
--------------
..\..\..\filters\inc