.htaccess重定向根文件夹上的所有内容

On my sites, when type www.abc.com/folder, it's redirect to index.php. And I want the script don't touch on others folder and files. So is there anyway to prevent this?

This is the .htaccess file:

RewriteEngine on
RewriteCond %{request_filename} -f
RewriteRule ^(.*) $1 [L]
RewriteRule ^([a-z]+)(/([^/]{0,32})(/.+)?)?$  index.php?a=$1&q=$3    [L]

To redirect everything from root only to home page you can use this rule:

RewriteEngine On

RewriteRule ^[^/]+/?$ / [L,R]

RewriteCond %{request_filename} -f
RewriteCond %{request_filename} -d
RewriteRule ^([a-z]+)(/([^/]{0,32})(/.+)?)?$ index.php?a=$1&q=$3 [L,QSA]