It seems like something called SketchUCation SCF RBZ Tools (or something similar) has part of its source code outside of its own installation folder.
This is not really the recommended way to make SketchUp extensions. Either the zip stuff should be contained within the extension using it, or it should itself be a proper extension with a name and an author showing up in the Extension Manager, and the extension using it should have error handling with a download link and installing instructions if it is missing.