How to map a URL to an attachment I'd like to have a simple and clean URL for a PDF file, such as

http://www.examples/file1


that maps to an attachment in a Drupal node, rather than using something like

http://www.examples/sites/default/files/files/file1.pdf


I've tried using URL Aliases, but Drupal complains and won't let me create the alias.  I can obviously do this with Apache redirects (with mod_rewrite) or (gasp!) with a meta tag refresh, but both seem inferior to being able to manage it from within Drupal.
You can use File Aliases module for this.