E9: Work around EpiString.ExecutionPath?

First off, does anyone know where EpiString.ExecutionPath is set?

Here is my problem.  I have an in-house dll that I need to reference.  In order for me to use the in-house dlls, I have to copy them and paste them into the Epicor client folder.  I don't want to do this?  Vantage 8.03.xxx did not require the copying or moving of this dll.

So I found in the Custom XML Editor EpiString.ExecutionPath. before the dll's name.  Does anyone know how to work around this issue to leave the in-house dll in it's default location?