Most browsers are configured to display, on screen, any file with a file-type of TXT, rather than asking you if you want to save the file to disc. Some browsers may think a file is a TXT file even when it is not.
Therefore, if you have problems downloading the TXT or ENL files, you must convince your browser not to display the files. The procedure will depend on the browser you are using. Try right-clicking on the link and selecting 'save target as' or 'save link as' from the menu you are given. Alternatively, display the text file on the screen and find a 'save as' option in your file menu.