The Images pane shows a tree of all the files in your image, sorted by type:
The System Builder can determine which shared libraries are required since it inspects the NEEDED section for the binaries. Since DLLs don't get listed in the NEEDED section, they're not automatically included. If they exist in the NEEDED section, every DLL would have to be linked into every server (i.e. io-net would have to load every driver at runtime, as well as every protocol stack.) Alternately, you'll have to rebuild everything to specify all of the libraries you're using. Ensure that you include the proper driver; otherwise, you'll have to rebuild.