Ho to get "Referenced Assemblies" in translator packages so that the translator sees the correct UI?

Our project has several 3rd party dlls that are not localized but used for resolving, rendering... In Passolo you can copy them to a subfolder named "Referenced Assemblies" and they will be used but not added to the translation list.

Opening a DLL in Passolo (full version) renders the UI OK. Exporting the project for translator's edition doesn't. I tried to add these DLLs as "user files" in the package, but it didn't help.

How can I add these DLLs so that our translators can see the correct UI during translation?

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