multisite htaccess-protect one blogs.dir subfolder

hello!

once again, i’m asking for help!

the uploads of a new site in my multisite installation should be htaccess protected, all the files are in /wp-content/blogs.dir/19 whereas 19 is the id of the new site.

if i put a .htaccess file in the /19 directory it looks like it is ignored by the server as in there’s no authentication needed. i only need to prevent unauthorized people from accessing the content of this folder (including subfolders), not of all the other blogs.

i checked the main .htaccess file and part of the original .htaccess content for the multisite installation is this line:

# uploaded files
RewriteRule ^files/(.+) wp-includes/ms-files.php?file=$1 [L]

is this the reason why it’s not working to put a .htaccess file in this ../19/ folder?

i thought this should work without a problem, but alas, i have one.

any ideas? thanks so much in advance!

bye,
kwentin