example.com                # shows index.html in root or error page if not exist
example.com/test.txt       # shows test.txt in root
example.com/test.php       # runs if IP matches or error page if not exist
example.com/dir1           # shows index.html in dir1 or error page if not exist
example.com/dir1/test.txt  # shows test.txt in dir1
example.com/dir2           # shows index.html for dir2 if IP matches or error page

...
<FilesMatch "^.*$>
    Require all denied
</FilesMtch>
<FilesMatch "^.*.(html|txt|pdf)$">
    Require all granted
</FilesMatch>
<FilesMatch "^.*.php$">
    Require ip 192.168.0.10
</FilesMatch>

<Directory />
    AllowOverride None
    Require all denied
</Directory>
<Directory /var/www/html>
    AllowOverride None
    Options Indexes FollowSymLinks
    <LimitExcept GET POST OPTIONS>
        Require all granted
    </LimitExcept>
</Directory>
<Directory /var/www/htm/dir2>
    AllowOverride None
    Require ip 192.168.0.10
<Directory>