Hi @ashotgev,
That’s not anything included in any of our software. (You didn’t mention which of our applications you’re using, or what version – please include this in future posts.)
Is your files_dir (as configured in config.inc.php) a subdirectory of your web root? If so, that’s not a safe configuration, and it’s possible your installation has been hacked. See e.g. this thread. This is indicated on both the install form and in the documentation (e.g. docs/README).
Regards,
Alec Smecher
Public Knowledge Project Team