Stig, let me explain how it works. Our routing system works with the conditions and rules described in our .htaccess file. These rules tell the system to forward the request to the index.php file if somebody requests any site page. If you uploaded file which does not obey our routing system, you should add an exception in the .htaccess file, so if someone requests the uploaded file - system would not forward the request to the index.php file. The rule you should use to add the exception is:
RewriteCond %{REQUEST_URI} !^/c2abdaefe2a4572990593a71e8f7627b\.html
This condition should be added at the top of the conditions list in .htaccess file.
You will need to add additional rules for each specific file. This is how our routing system works and there is no possibility to write one rule for all files.