I'm unsure whether the following is correct considering I can't find a web example that targets a file inside a directory.
<FilesMatch "/out/index.php$">
Header set X-Robots-Tag "noindex, nofollow"
</FilesMatch>
is it ok that way or:
<FilesMatch "\out\index.php$">
Header set X-Robots-Tag "noindex, nofollow"
</FilesMatch>
First one is the right one as Apache like Unix systems uses forward slash for paths.
So the right one is:
<FilesMatch "/out/index\.php$">
Header set X-Robots-Tag "noindex, nofollow"
</FilesMatch>