Flippa Verify Site - File Not Found 404

Hey guys,

I uploaded the verify file flippa_XXX.txt but when i go to:

mysite.com/flippa_XXX.txt or also mysite.com/license.txt

I got a 404 page not found error.
This happens with every TXT files!

This's my .htaccess file:

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>

# END WordPress

Code (markup):

Please help me