Media Location in WPMU Install Directory

I have recently started with a fresh WPMU install.

Previously I had posted this issue here:

http://wordpress.org/support/topic/media-redirect-htaccess

I have migrated my old site to new one however on my old site I had used a .htaccess mod to redirect all media files from:

/wp-content/blogs.dir/2

TO

/files/

Previously I used a .htaccess mod to do this re-write

# uploaded files
RewriteRule ^([_0-9a-zA-Z-]+/)?files/(.+) wp-includes/ms-files.php?file=$2 [L]

however after updating it looks like the new file structure is:

/wp-content/uploads/sites/2

I would like to redirect this back to for the sake of pretty permalinks and my old links to work:

/files/

Currently this link works:

http://zombieprepkit.com/wp-content/uploads/sites/17/2013/09/randombutton.png

while this link is broken:

http://zombieprepkit.com/files/2013/09/randombutton.png