Deploying BizTalk 2006 MSI: Configuration file issue

Hi,
Situation:
My BizTalk solution had BizTalk components along with some Dll’s. I also
have a config file used by Dll’s. I have added it as one of the resource. The
destination path for this resource file is
\”%BTAD_InstallDir%\\My.ConfigFile.xml\”.

Question: how can I know the path where this application is installed? I
need that path to access that configuration file. So, basically while
creating my Dll’s, I need a way to reach the My.ConfigFile.xml destination
path without hard coding it.

Thanks in Advance,
Milan