I don't know if I understand you, correct me if I got something wrong
Yes, there is only one dll in Log Parser's folder and it's logparser.dll
I created a reference to it in my Visual Studio 2008 project and it shows as Interop.MSUtil.dll
and the app works great...
In Visual Studio 2008 it looks like this
+ MyProject (with Interop.MSUtil.dll)
- SetupWizard
- Detected Dependencies
> .Net Framework
> Interop.MSUtil.dll
> Primary Output From ....
So that dll ships within my msi installation and it's being created inside my app folder.