The txt you exported contains citation information, that is, the title, author, unit, publication time, source and other information of this article. In fact, endnote manages this information. If you need the original pdf document, you need to download it yourself, and then link to the corresponding entry in endnote. After selecting the article, click the "export" option on the right side of the guide card, and then click the export button. On the search results overview page, please check the patents of the current page (there is the option of "Select All This Page" in the "Select Operation" at the top of the search results list), add document favorites, and then click the "Document Favorites-Export" function button on the right side of the page to export the file to Excel format.
You can also download it and copy the text inside with the software CAJViewer. It's simple.