These are files for which previewers exist. Clicking on the explore button will open a second tab displaying the file contents. In future versions of Dataverse, the plan is to include the preview directly in the file page. For the image previewer, be sure to click on the image. If the original is larger than the screen size, you'll be able to zoom in.
This data repository is not currently reporting usage information. For information on how your repository can submit usage information, please see our documentation.