WordPress MU .htaccess file
Here’s the correct .htaccess for a subdomain type of installation for WordPress MU version 1.1.1. Please double check your .htaccess for correctness. This file needs to be on the base level of your WordPress MU install. Here’s the code:
RewriteEngine On
RewriteBase /
# Rewrite www.domain.com to domain.com
RewriteCond %{HTTP_HOST} ^www\.(.*)
RewriteRule ^(.*) http://%1/$1 [R,L]
#uploaded files
RewriteRule ^(.*/)?files/$ index.php [L]
RewriteRule ^(.*/)?files/(.*) [...]