FileViewer shows a file in the page, choosing how from its type: an image with zoom, Markdown rendered or as source, code and text coloured, a zip archive as a folder tree. Here it previews the files stored in a Dataverse file column.
Pick a file in the grid: its content is read from Dataverse and shown beside it. Open the zip to browse its folders and preview the files inside. Files you upload on the File Upload demo show up here too.