The file is available under two names (for two different file types). With the file type .abc , the server will send the file as Mime type "application/octet-stream" (which is normally used for binary files such as .bin or .exe). Your browser will probably not let you look at the file, instead it will want to download it.
With the file type .txt it should come as "text/plain", which should allow you to look at the file without downloading. abc software may require a file type of .abc, so you may need to change the name if you get it this way. The actual contents of the two files are identical.
Get the tune file--.txt type.
Get the tune file--.abc type.