and call it anything you like, as long as it means something to you.
Now put the Excel file into it. Make sure it's the actual file and not a shortcut.
Now create a hyperlink to the file itself. The link can be anything, a word, or a small image, or a button. Save the changes to the server.
Now, visitors to your site will get the file when they click on the link, and provided they have Excel installed on their computer they'll be able to open it.